I reccommend visiting
http://www.lavasoftusa.com/software/adaware/ for a copy of Ad-aware. It'll root out poison cookies, gator, and a host of other evil internet items.
You can permanently avoid redownloading gator by using a "hosts" file in your "c:\windows" folder to block it.
Basically, you have your computer redirect any request for "gator.com" to some invalid IP (such as your own PC). Thus, as far as your PC is concerned that whole evil site dosen't exist.
I have posted a copy of mine on
http://imagemodserver.mine.nu/Miscellaneous
in case you want to try it.
Note: If you find you can't get somewhere you really want to go, check to see if its in that file. Remove the entry and save to restore access.
Just don't bother telling me about it cause chances are its not an appropriate site for people to visit
