Link9rly I will vote for your reply as the most useless on next Argo Oscars. On a serious note: It's not good to add ENB for no reason at all. As MrTrane pointed to the .asi fix, it's the best solution around.
I'm not sure what you know about hardware or software, but you definitely don't know SA lol. Mouse fix doesn't fix the tabbing issue on all installations.
The ENB fix has been the most stable fix I've used. I'm not sure if you know how ENB itself works, but you can disable all additional graphical effects for it. That's why I suggested it, even though OP said he doesn't want it. The only difference would be the intro "ENB loaded" text at the game's intro loading screen. To add to that, a different .exe wouldn't fix this.
The only thing that I failed to describe on op is that I am running samp.exe on Windows 98/ME compatibility. If I don't, it constantly crashes when it finishes to load.
You shouldn't have to run it in compatibility mode. That's one thing SilentPatch is for. It can also have issues if you have gta_sa.exe running in 98 compatibility and samp.exe running without it. I'd set both gta_sa.exe and samp.exe to run as admin
like this if you want to use admin on anything. Since you're using .asi files, I'd also
suggest disabling DEP for gta_sa.exe. Your milage may very, but it has solved my issues when regarding .asi and .cs mods crashing my game.