I'm familiar with Gator and Xupiter. Whenever I run Morpheus, it tries to install Xupiter.
Use the following link and download Lavasoft's Ad-Aware. Run it on your hard drives. When it gets done, it'll show a listing of probable spyware, scumware, and suspect cookies. Delete what ever is in the list by placing a checkmark beside them (unless you recognize it as something different). I run Ad-Aware every two weeks (you can set it up in your Scheduled Tasks---Start>Programs>Accessories>System Tools>Scheduled Tasks).
Also, you can download the RefUpdate program, to automatically update Ad-Aware whenever they put out a new spyware/scumware reference file.
Kix