Invalid signature error message

Hello,
I am receiving this message while trying to updateiTunes software:
"iTunes" has an invalid signature.
I tried to download then install manually and get the same errors.
The box is checked in Internet options to allow if invalid signature.
I found this answer but the link is not available any longer. Is there another fix available?
wiclee
Currently Being Moderated Re: «iTunes» has an invalid signature. It will not be installed.» HELP!
Jun 24, 2012 7:46 AM (in response to fimeck)
Go directly to Apple link to download
http://support.apple.com/kb/DL1426
Select "Save" instead of "Run". Once downloaded, right click the iTunesSetup.exe or iTunesSetup64.exe and select 'Run as Administrator' to install.
Thank you
Patty

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

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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).
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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.
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The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down the page in case one of them applies.
The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for installation or performance issues, or compatibility with QuickTime or third party software.
Your library should be unaffected by these steps but there are also links to backup and recovery advice should it be needed.
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Message was edited by: kiichi

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