Freaking Out!!

[Dymondeyez]

I ordered the sims 2 from ebay because my disc 2 was ruined. I played the sims 3 game until my sims 2 game came in the mail. I installed it downloaded a few things then when I tried to play it, it didn't work it crashed. I deleted all of my downloaded content and it still crashed. I have been on so many forum site of people asking the same question about their sims 2 game crashing and I followed the instructions that they gave. But it still crashes. So, I said f#*& it!!! and I decided to uninstall it and go back to playing the sims 3. I tried playing my sims 3 game that worked perfectly fine at first, but now its crashing too!!!! someone please help I don't know what to do and I desperately want to play this game.

ETA: Everytime I try to uninstall the sims 3 a error message comes up and wont let me uninstall it.