"Forged Alliance appears to be corrupt and/or modified. please reinstall forged alliance"
This message appears everytime i reinstall FA as well as gpg. i am running on windows vista 64bit. btw a similar message appears when i try to play on supreme commander server as well, how can i fix this? is it the patches fault or my own?

FA retail to full patch: http://cdn.thqonline.com/SC/Patches/sup ... 5.3599.exe

Download that and run it as admin and in Windows XP Service Pack 3 or lower compatibility mode. Always run GPGnet like that as well.

I downloaded the link and im running it as admin but it has an error: unable to find version 3596. how do i run it on windows xp service pack 3? as well as gpgnet

Right click > properties > compatibility

I think on Vista the XP compatibility only goes up to SP 2 but that should work just fine. If you keep getting that error try again with a fresh install of FA.