Trouble installing latest Flash 11.4.402.278

I don't know what I'm doing wrong in installing Flash Player 11.4.402.278. I have Windows XP 7, 32-bit, and use Mozilla Firefox. When I download, I save the file, although it doesn't show on Downloads list. It does show up, saved, in My Documents. The Run File box has shown once (I clicked yes), didn't run, so I left-clicked, got Run File, again clicked yes, and got "Only 1 single instance of this application can run". Since I've been trying, I then deleted the one other time the same downloaded file showed up in My Documents, so there's 1 file. Proceeded a step (got through Run file), then got "Certificate of authentication failed." What to do? Thanks.

Download and run the offline installer from http://helpx.adobe.com/content/help/en/flash-player/kb/installation-problems-flash-player- windows.html#main-pars_header
[topic moved to Flash Player forum]

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Adobe Flash 11.4.402.278 causes browser lockups & erroneous download requests

I've installed Adobe Flash Player 11.4.402.278 on multiple Windows 7 Pro computers. After the install, various websites (i.e. MSN.com, Yahoo, YouTube) lock up when trying to open. This problem occurs in both IE9 & Firefox. The workaround in IE9 is to disable the Adobe Flash Shockwave add-on. Secondarily, users repeatedly receive requests to download Flash even though it is already installed. To make matters worse many video files will not play even after the user reloads Flash 11.4.402.278. Does anyone know how to revert to an earlier version of Flash? I didn't have these problems with the previous version (.265, I believe).

>Chris - I've installed 11.4.402.287 logged in as Domain Administrator on the HP laptop, then logged in as the regular user, and web browsing all ok now. So it looks for now the issues I've been specifically experiencing have been resolved. However, I think I will in future incorporate some acceptance testing before I start deploying future version of Flash everywhere!
> quarky422 - In the specific cases I reported I had the described problem and solution that worked for me, and the latest release has hopefully fixed that issue for good. With the plethora of machine configurations out there I guess everyone has unique issues, but my approach is simple: if it worked before something was updated, start rolling back until you identify the cause. It took me a few hours to identify the issue and I went down the wrong track initially (thought it was to do with a web site the customer visited then I also visited on a different computer and had the same problem, but when reports came in from other users I knew that couldn't be the cause). I really thought it was down to a Java update, so uninstalled that and Flash and it worked. On the next machine just removed Flash and it worked, so re-installed Flash while logged in as the user, and it still worked. This link
http://forums.adobe.com/message/4323109 seems to be a fix though I have not tried it as the latest version fixed my particular problem, so may fix yours as well? You don't say if you are logging in as Domain Admin or Local Admin.

Is anyone having trouble installing Adobe flash player on a MacBook Pro?

Is anyone having trouble installing Adobe flash player on a MacBook Pro with OSX 10.7.5?

Thanks for your help here is what I did so far!
I have uninstalled Adobe and reinstalled it, I've tried restarting my browser, then my MacBook Pro without any success!
When I click on the Apple in the upper left hand corner and open System Preferences I can see Adobe Flash Player on the bottom under the Other section.
If I open Adobe up and check the version it tells me that I have the most recent version!
I even uninstalled Adobe and installed the newest Beta version, but Adobe is still not working! If I check for the latest version it tells me that I do have the latest beta version, but it still doesn't work!
If the person who made the video used any other video player it works!
Their player, plays the video without a problem!

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Hi my name is Derek in I'm having trouble installing adobe flash player for Kindle HD could you please help me.

Dj5263 wrote:
Hi my name is Derek in I'm having trouble installing adobe flash player for Kindle HD could you please help me.
You'll continue to have trouble, because...
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Having trouble installing adobe flash player on my mac

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Thank all that replied to my post. I was able to successfully install Flash Player following this procedure:
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2. Mac HD/Library/Application Support/Adobe/Flash Player
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I'm having trouble installing Adobe Flash Player. Get a failure to initialize message. can you help

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Dj5263 wrote:
Hi my name is Derek in I'm having trouble installing adobe flash player for Kindle HD could you please help me.
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Hellohello!
My Adobe Flash Player for Mozilla Firefox has been giving me troubles these past months, so today I decided to install a more recent version on my laptop.
Following the instructions, I deinstalled the old version before initializing the download/installation of the latest Flash Player. That, however, proved to be a mistake, as the installation has failed continously so far and now I have no player to my avail at all.
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Hi Laura,
Most of these installation problems are caused by antivirus apps. These days, practically all of them incorporate web shields to protect you from downloading malware, files shields to prevent you from installing rogue pograms and the like. It's the file scanner which is the most problematical because it springs into action as soon as you run an installer of any kind. This interferes with the installation process and leads to file corruption further down the line.
In the current circumstances, I suggest you proceed as follows. First of all, disable all antivirus shields. If you happen to be using AVAST antivirus, right click the orange icon in the systray and choose to disable all shields for one hour. If you're using a different AV app, look for something similar in the user menus. Then proceed as follows.
Download the Flash uninstaller from here: http://kb2.adobe.com/cps/141/tn_14157.html
Close all browsers.
Reboot. This is important to clear the Windows Registry after you uninstall something.
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You may require this player as well: http://get.adobe.com/shockwave/ It's rather like an enhanced version of the Flash Player and you'll need it to play games where you have some interaction with the animation. You don't need to run an uninstaller for this one. Simply download and click "Run" in Internet Explorer where you want to install it in that specific browser, or choose "Save" when you want to install it in any other browser.

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I first tried to just re-install it, but saw that I already had it installed, so that's when I tried updating it to the latest version. Since neither worked, I uninstalled Adobe flash and tried a clean install, but the same error appeared at about the same time during installation.
Before I uninstalled Adobe Flash, I checked the version and it matched the latest, however, every page that uses flash says I need to install the update and prompts me to do so before continuing. Any advice will be much appreciated. Thanks in advance!

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Installing latest Flash 10.1 in Firefox 3.0.19 on XP/32-bit

After uninstalling the previous version of Flash I found that the new Flash plugin would not install. I could download a file gp.xpi, but clicking it gave a message like "application unknown". I found that I had to manually select Firefox as the application to open the file gp.xpi in order to install the plugin. I've had the same trouble previously with Flash. I think that the instructions could be improved to cover this case. (Also it's not easy to find the article http://www.adobe.com/products/reader/dlm/firefox_steps.htmlhttp://www.adobe.com/products/r eader/dlm/firefox_steps.htmlhttp://www.adobe.com/products/reader/dlm/firefox_steps.html though this may not be related to my problem.)

The links above (copy and paste) are
http://www.adobe.com/products/reader/dlm/firefox_steps.html
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Do the following:
download the FP uninstaller from http://kb2.adobe.com/cps/141/tn_14157.html and save it to disk;
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open Windows Explorer and navigate to C:\Windows\system32\Macromed\Flash
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Trouble installing latest Flash 11.4.402.278

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