That was my question and you answered it.
Now:
Right-Click on GTA_SA.exe > Properties > Compatibility > Compatibility Mode >
then click "Run this program in compatibility mode", then click the scroll down menu and click "Windows XP (Service Pack 3)"
So it should look something like this:
Then after all that's been done, do this:
Right-Click on GTA_SA.exe > Properties > Compatibility > Privilege Level >
then click "Run this program as an administrator"
So it should look something like this:
After all this is done, restart your computer and try to launch the game