Itunes & QT invalid signature

I have installed both programs on my laptop (windows based) but my PC will not let me. Every time it tells me that the program was blocked because of an invalid signature. I have turned off my firewall, antivirus and popup blocker. What more do I need to do to make it work? I am runing windows XP home and have IE 7.

I think I found the answer on Microsoft's page. Start here and see if their solution to this helps you out:
http://support.microsoft.com/kb/843022

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I run Windows 7 and the newest version (10.6) of iTunes will not install. The installer won't even begin, and when I run the Apple Software update, it tells me that iCloud and iTunes have invalid signature.

When I run the Apple Software update, it tells me that iCloud and iTunes have invalid signature and will not be downloaded. When I DL iTunes64setup.exe, the program will not start (there's a bar that flashes but nothing actually begins). I've done everything short of reinstalling Windows to fix this (system resore, unistalling all Apple products, taking down firewall, running Windows FixIt - which either won't find the problem or gives me an error saying that the troubleshooter cannot be downloaded at this time, going into the security features to allow programs without valid signatures, trying to install earlier versions of iTunes). It all started when I downloaded the Decemberists new album on my iPhone, and it wasn't downloading it properly so I connected it to my Dell, but some songs still wouldn't DL - also, the newest OS for my iPhone still won't install via WiFi - and so I uninstalled iTunes first, but nothing is helping. And I don't have any security issues (Norton has checked). Any ideas? I'm at my wit's end after 3 days of this. Thank you.

Ok, so after like 4 days of going through all these different issues, I figured out that several programs weren't downloading, and it was an issue with my wireless connectivity messing up the digital signatures, so if you plug in your comp to the modem and delete your temp files, it should start to work!

Itunes 10.7 wont startup or run on windows 7 64 bit,, while downloading it from previous version of itunes say invalid signatures.

whenever i used to download something from itunes it restarts in mid,, and starts again and does the some for a long time and atlast says error 8008. Then i tried to upgrade it new itunes would download for some time then gives error saying invalid signatures,, I then downloaded itunes 10.7 from apple website.. download completes and it wont run.. wont start up.. I have tried Run as administrator used new user accounts, downloaded it again and again deleted temp folder aswell, deleted itunes library from my music folder aswell, done everything i found in discussions but that wont help,

Apologies about the delay. I've been brooding.
Although we don't know where the specific relevant keys are on modern versions of iTunes, there's a shotgun approach we can take to dealing with them, which has a reasonable chance of success in this case. The complicating factor in your case is that you've got a 64-bit Windows. So there's an extra hoop to jump through.
The basic approach is the procedure from the following weblog entry:
[Solving setup errors by using the SubInACL tool to repair file and registry permissions|http://blogs.msdn.com/astebner/archive/2006/09/04/solving-setup-err ors-by-using-the-subinacl-tool-to-repair-file-and-registry-permissions.aspx]
The complicating factor is that we have to make an additional edit to the reset.cmd file.
When you're in Notepad, replacing the two YOURUSERNAME values with the name of your Windows 7 user account, in the first line of the batch file, replace the:
%programfiles%
... with:
%ProgramFiles(x86)%
(On a 64-bit Windows system, subinacl is installed in a different location than on 32-bit systems. So unless we make that change, the reset.cmd isn't going to be able to find subinacl and the reset.cmd won't work.)
While you're in Notepad editing the file, make sure each of the nine lines of the file start of a new line. (Sometimes they get smooshed up together on a single line, and then again the reset.cmd won't work.)
I'd strongly suggest setting up a System Restore point immediately prior to running the reset.cmd. There's instructions on that in the following document:
http://www.bleepingcomputer.com/tutorials/tutorial143.html#manual

Itunes update invalid signature

When attempting to install the latest ITUNES update, the apple software update screen gets about one quarter of the way started and then I get an error that says I have an invalid signature and install will not be completed. This is the first time I've gotten this error and this is the only computer I've ever used. What's going on and how do I fix it?

Try updating your iTunes using an iTunesSetup.exe (or iTunes64Setup.exe) installer file downloaded from the Apple website:
http://www.apple.com/itunes/download/

I have Windows 8 on my computer. I have Itunes 10 installed, but I cannot download Itunes 11. An error message says that Itunes has an invalid signature. Can anyone help?

My computer has Windows 8. I keep getting an error message when I try to download Itunes 11----Invalid signature. Can anyone help?

That suggests that the installer is getting damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

Problem updating itunes, keep getting invalid signature error message!!

Trying to update my itunes to latest version, keep getting "itunes has invalid signature" error message, any ideas of how to remedy this?
Many thanks in advance.
Meerkat68

I've had this problem for awhile in Windows XP SP3. Last night, the simplest thing occurred to me...here's what I did (and I'm telling because it worked).
1. Clicked on Start
2. Clicked on Control Panel
3. Chose Add/Remove Programs
4. Found Apple Software Updater and clicked Remove, then responded Yes
5. Went to apple.com and clicked on Support, and then Downloads
6. Downloaded the latest version of Safari ONLY
7. Installed Safari (knowing it would install the latest version of Apple Software Update)
8. AFTER the installation was complete, I clicked again on Start, then All Programs
9. then, clicked on Apple Software Update

ITunes won't find new iPhone and update invalid signature

Trying to restore from iPhone 4 Restore backup to new iPhone 6 (Windows 7) and encountered the following......
When trying to connect the new iPhone 6 to my existing iTunes account, iTunes would not show the device (couldn't find it). Received a popup that stated the phone could not be recognized and an update to 11.4 (12.1....) was required. [[ I found this strange since I just updated and backed up my iPad and old iPhone 4 last night in anticipation of getting the new iPhone 6 today.]]
I tried the update multiple times but it would stall 15 minutes in and give the message "invalid signature" and error out. I looked through many comments on this support sight, read what related help was available through iTunes help, etc, and spent HOURS trying each one (listed below). A combination of a couple of steps finally worked for me so I am sharing this to hopefully save you some time and frustration. MUCH frustration.
Tried but did not resolve..... updated new phone to current 8.1.1 and made sure 'Find My Phone' was turned off.
Tried but did not resolve..... downloaded iTunes manually from within iTunes.
Tried but did not resolve .... downloaded iTunes manually from Apple.com downloads.
Tried but did not resolve..... downloaded Firefox (an alternative browser) and manually downloaded iTunes again from Apple.com.
WARNING: The following resolution will wipeout any previous iTunes settings like views, organization, etc. It will also wipeout any previous setup already done in your new iPhone other than fingerprinting, language and date/time setup. Email accounts, setup preferences, etc, will be wiped. Also, your old phone will no longer work with iTunes - apprently this new software issue will only recognize one phone. Your music, contacts, most apps (I did lose a few), if backed up from your old phone properly before starting this process will 'Restore' to your new phone in the updated iTunes.
Tried and worked..... Closed iTunes. Went to Start on my computer, typed itunes64setup. I had two itunes64setup listed due to the first manual download from Apple and then the one done again via the Firefox browser. I chose the one downloaded from the Firefox browser - not sure it would make a difference. (If you have two listed, Hover your mouse over each and it will give you the times of when they were downloaded). Right click on the itunes64setup and choose 'Run as Administrator'. (You may incur issues with this step if using a work proprietary computer.) Opened iTunes and plugged the iPhone 6 in and it recognized the phone. I was then able to 'Restore' info.
Since I had already tried the manual downloads, I am not sure if they were necessary and maybe running the itunes64setup only would have resolved the issue. If you are addressing the iTunes update iPhone 6 issue and try the itune64setup without the manual downloads, etc, and it works, please update this support entry so others can follow your lead.
Thanks!
What Apple is not telling (WARNING) their faithful users about is that they obviously have software issues for existing users in the 'Windows' world when upgrading to the newer phones and to do so you are going to need to spend some time and effort. This is strike two for me, just coming off the 8.1.0 iPad 2 upgrade debacle Apple put so many of us through. Shame Shame, Apple! It's called Q/A and should be applied to all your users environments and not just those who have everything new in an Apple/Mac only world. There are more of us that don't. Thx!

Step one : Please restart EVERYTHING involved. This means your cable modem / dsl router, Airport Base Station if you have one, your computer, your iPhone / iPod Touch / iPad (2) if applicable. Shut it all down and power it all back up in the appropriate order (modem / router / computer, et cetera)
Step two : Make sure you have the most recent version of all software. Verify you have the latest version of iTunes and the Remote software. Check to make sure the AppleTV has no updates as well.
Step three : Enable Home Sharing on all applicable devices.
Step four : Make sure the AppleTV and the computer are both hooked up to the same network, wireless or otherwise, and make sure if you have a non-Apple router anywhere in the mix it is allowing traffic to flow freely between all the Apple tech. Apple has specific documentation on this. Search the Support site for "Apple TV: TCP and UDP ports and protocols used" and make sure none of those ports are being blocked by the router or any firewall software you may have running, like Zone Alarm.
Step five : Fire up the Remote app on your phone, and let it search for your AppleTV. There should be no passwords required anywhere if the Apple tech is properly talking to one another.
Step six : If all the above still doesn't work, then call in a professional who can get eyes on the equipment and do a proper job of troubleshooting.
Please let us know if this does not help.

When I try to download the latest version of iTunes on my iPod Classic I get the message that "iTunes has an invalid signature" and that "Content was blocked because it was not signed by a valid security certificate. Anyone know how to fix this?

When I try to download the latest version of iTunes from apple.com, I get the message "Content was blocked because it was not signed by a valid security certificate."When I open iTunes and try to download the latest version there, I get the message "iTunes has an invalid signature. The download has been removed." I have also gotten an Internet Script Error stating that an error has occured in Line 0, Char O and that "Access is denied to images.apple.com/global/scripts/lib/iepngfix.htc." This problem has never occurred with earlier versions of ITunes. Anyone know how to fix this problem?

Are you downloading iTunes form an Apple website or somewhere else? If the answer is somewhere else, try downloading it from Apple. Click on iTunes in the black menu bar above and go from there.
Let us know what happens.

HT1926 Trying to download itunes update on my computer windows Xp... Tried 3 times and keep getting an error: invalid signature/will not be installed. HELP

iTunes is downloaded, been using it for years. I went to download an update and I keep getting an error.Error message is: invalid signature/will not install.
I did try to update manually as instructed however that also came with the same error.
If someone can advise it would be greatly appreciated.
So what is an invalid signature and how to fix it???

I would think the link doesn't work now as we are on version 10.7.
If you go to:
http://support.apple.com/downloads
the latest update for itunes is in the left hand column. If you follow the rest of the instructions from wiclee/fimeck it should work.
"Select "Save" instead of "Run". Once downloaded, right click the iTunesSetup.exe or iTunesSetup64.exe and select 'Run as Administrator' to install." (or use default)

I am getting "invalid signature" error when i try updating itunes. How do I fix?

I received a notice that an update was available for itunes. I went through the installation
process and then near the end an error message came up telling me that it would not be installed
because of an invalid signature I tried doing this again only manual this time and the same thing happened.
I have never had this happen before. What is the problem? How do I fix?
Thanks, JKay

Twanger317,
Have you tried to do a repair install on the pc of iTunes? Also if that does not work i would follow these instructions on removing iTunes and reinstall. http://support.apple.com/kb/HT1923 for windows vista and 7 and http://support.apple.com/kb/HT1925 for windows xp. let me know if that helps.

Please help me itunes 8 wont load w/ invalid signature error

There has to be some sort of cosmic joker who is laughing at all of us. Perhaps the folks at Verisign are playing games with us or maybe it's Microsoft. How can there be a requirement to upgrade to itunes 8 when you purchase a new Nano and then not be able to do it because of an invalid signature error. I'm not the only one who has had this problem as I see it all over the web. I have tried it on another system sitting right next to this one (Win vista x32bit) and it didn't work either. I have deleted everything and updated win installer ver 4.5 and nothing works. The application wont run because of the signature error. I'm sure that the powers that be know what the problem is but dont want to release the fix because one side or the other hasn't been paid the appropriate money. It's always about the money. I have read every thread and suggestion that I could find but cant get it to work. If anyone has the answer please help me. I'm not a technotard and this is frustrating

I am afraid AFIK a clear cut solution for this hasn't emerged.
Are you trying to update with Apple Software Update. You might try repairing it from add/remove programs and trying again after a restart.
Have you tried downloading the iTunes installer from here:
http://www.apple.com/itunes/download/
Save the file on your desktop and run it from there.
I would clear your temporary Internet files and restart your PC before doing this.
If that doesn't work, maybe running the installer from your browser would work, although saving the file is usually best.
I have one report that a problem with a router causes this problem and that replacing the router fixed it, but in this case all downloads were affected.
It would be interesting to see if you can install the standalone Quicktime as a test. You can download it from here:
http://www.apple.com/quicktime/download/win.html
You want the version without iTunes, which is not the default.

Itunes cannot be updated because it has an invalid signature

I am trying to update my itunes as well as my icloud on my computer. When I update them, I get an error message that tells me it cannot be updated because of an invalid signature. Since I cannot update either of them, I cannot do the new iso8 update on my computer.
Help!

try this. it worked for me.
http://en.kioskea.net/faq/11771-allowing-software-with-invalid-signature-to-run- or-install

I am trying to upgrade to iTunes 11.4 and get an error message that says " iTunes has an invalid signature. It will not be installed" How do I fix that?

I am trying to upgrade to iTunes 11.4 on my Windows7 PC and get an error message that says " iTunes has an invalid signature. It will not be installed" How do I fix that?

Hi curliejo,
Welcome to the Apple Support Communities!
In your situation I would recommend the steps in the following article for troubleshooting iTunes. It may be necessary to completely remove and reinstall iTunes in this situation. Be sure to remove all of the components with iTunes in the correct order as outlined in the article before installing fresh.
Issues installing iTunes or QuickTime for Windows
Have a great day,
Joe

When I try to update to Itunes 11 I get an error message saying that Itunes has an invalid signature and wont be installed. I use Windows 7.

Everytime I try to update to Itunes 11 I get an error message saying that Itunes has an invalid signature and can't be installed? I have tried to install it two times and get the same message each time. Any solutions to my problem?? Those who have installed ITUNES 11 is it hard to work with? maybe im lucky it wont update?? I don't know.

That suggests that the installer is getting damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

I am trying to update i Tunes to new version i get a message saying iTunes has an invalid signature and will not install.Any help please.

I am trying to update iTunes to new version .
When it goes to install i get a message saying iTunes has an invalid signature and will not install.
Any help please.

Go directly to Apple link to download
http://support.apple.com/kb/DL1426
Select "Save" instead of "Run". Once downloaded, double click the iTunesetup.exe to install.

Itunes & QT invalid signature

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