Someone mentioned that there's a fix, like this for Vice City:
http://www.argonathrpg.eu/forum/index.php?topic=75808.0Btw, it doesn't work with SA:MP, I tried.
EDIT: I found a fix for it!!
Right click the gta-sa.exe and go into properties, then go into the Compatibility Tab.
Now check Run this program in compatibility mode for: Windows XP (Service Pack 2) (Optional, I didn't need it)
Then go look down and check and make sure to turn on:
"Disable Visual Themes" and
"Disable Desktop Composition" and
"Run This Program As An Administrator" (optional, I use Administrator mode for SA:MP, not the game itself)
Hope it works for you guys!