I've been running GTA San Andreas on a 800*600 resolution and upon changing it to 1024*768, the game crashes. I'm unable to open the game again.
In order to fix your problem you will need to locate your "GTA San Andreas User Files" folder, you will find it in My Documents.
- Then you will open it and delete file called: gta_sa.set
- This will reset all of your Gta San Andreas settings (but it will keep save games)
Thanks to Padly1995
for this tip.