unknown error installing/removing sims complete..

[omaha1290]

oh boy, well idk if im screwed or what, but when i first posted about this problem i had tried what you just posted and made the backup, but before i used the back up i tried started at the beginning of your post, but as i said i just got done deleting all the sims stuff in my registry so there weren't any sims files in my registry so then i tried it with the registry backup i made before and now im back to my original post i get the unknown error aborting installation, rofl i think if i want to play the sims again i might just have to reboot my comp to when i bought it or is there anything elce i can try?