ahol29 ........
"OK, I used Microsoft Antispy and it deleted some files and crap. I think it deleted some that I needed or has done something else to the registry. "
It's odd that Antispy would have removed registry entries required to make your system work .....
That's why the Antispyware app suggested that you back up your registry in case you delete something you need .......
Uninstall Rollercoaster Tycoon 3 ............
RE Norton ....... "Now my Norton antivirus is like on the computer but not. I can't install it from the cd because it stops and says installation error."
When you removed Noton you didn't remove all referance to it ....... I think what you need is a " Norton remover " ........ D/L this ....C:\Documents and Settings\Don\Desktop\Tools\Norton remover\Norton_Remover.zip.html
Run this app.. and then try installing Norton again .......
Let us know how you make out ...
dl65