Help With playing GTA san andreas

[confusedGTA]

Ok.
Downloaded GTA san andreas last week and have been playing it online with the multiplayer. I did everything including the No cd crack and all that.

Today I moved a couple folders around and I guess that messed with the GTA cause the only way it would run is if I right click on it and "run program"..which means I can only play it single player. It wont load from the Multiplayer client software.

I unintalled and reinstalled twice and downloaded a new crack for the game and it does the same thing.

Anyone have any tips as to what to do?
What caused this?

someone please tell me that I wont have to redownload this game. It plays fine when I use the "run program"..

also, a sidenote. When I ran the program the only way I could and exited the game I came back to my desktoper wallpaper being taken away and replaced with a red background..some kind of glitch/error?