[Operating system : Windows 7 64-bit]
When windows started up it told me I could update to the latest version (11.4.402.265) regarding there was major performance improvements.
After installation I used my computer for a while until it froze on me.
It recommended me to do a system restore so it could start up properly, this restore deleted what stopped my computer from booting.
After rebooting it told me I could download the same update, doing so my AVG Anti-virus popped up saying that the file that updates flash player [INSTALL_FLASHPLAYER11X32_MSSD_AU_AIH.EXE] was a severe malware threat and must be moved to the virus vault. So i did.
Is it really a threat? And is that the file that caused my computer to freeze and unable to boot?
I'd recommend downloading again from get.adobe.com/flashplayer
As for what caused your computer to freeze, that's harder to tell. I'd recommend updating again and then let us know if you encounter more hangs/freezes. This is especially important if you're browsing the internet, looking at Flash content.
It's a false positive; my AVG anti-virus does not flag the same download. When were your AVG definitions last updated?
Anyway, I recommend that you download the offline installer from http://helpx.adobe.com/content/help/en/flash-player/kb/installation-problems-flash-player- windows.html#main-pars_header if you continue to have problems.