Intel graphics could be the issue. Try upgrading your drivers. Plus did you ever play with mods before? Because even after reinstalling, mods can be stored in a folder called VirtualStore:
C:\Users\youruser\AppData\Local\VirtualStore\Program Files\ and delete the Rockstar Games folder if present. Then uninstall, delete the GTA SA folder from Program Files, install again and report back. This only if you have used mods before the reinstall.
Edit: Girish beat it to me.