Firefox.exe is not a valid win32 application problem

I use Firefox very long time. But now I have problem. I mean Big problem! Few days ago I downloaded the latest Firefox (still beta version in Serbian), and used it day or two. After that period Firefox just "shut down". I couldn't start it again, so I wipe it off, and reinstall but nothing happened. I couldn't star it still. (I installed than English version - but didn't work again). When I tried to started Firefox got message, literally: firefox.exe is not a valid win32 application. And so constantly. I wiped again, reinstall, but result is the same. I tried this - http://support.mozilla.com/sr-CYRL/kb/Firefox%20exe%20is%20not%20a%20valid%20win32%20application, but didn't work for me.What should I do? Please, help me.

ewan,
i was dealing w/ the same exact problems, and here's what i did to sucessfully install the latest itunes 7.5 on my laptop:
1. i completely took everything dealing with apple/itunes out of my system (e.g. uninstalling itunes from my laptop)
2. went to http://www.oldapps.com/itunes.htm and downloaded version 7.4.3 to my laptop
3. when this was loaded on my laptop, i then went into itunes and went to the "help" tab and then went to "check for updates" and it alerted me that there was version 7.5 available
4. i then chose to update to that, and it worked fine and now i am sucessfully running 7.5.
I hope the helps, let me know if it does or not. good luck

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