1)Delete the folder where it is installled.
2)Ignore all prompts.
3)Do the following very carefully.
remove the following keys from your registry:
Goto start, run, and type in regedit. Then surf down the list to find these
keys and delete them.
HKEY_LOCAL_MACHINE\Software\Napster
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\
CurrentVersion\Explorer\MenuOrder\Start Menu\&Programs\Napster
HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Explorer\MenuOrder\Start Menu\&Programs\Napster
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Uninstall\Napster vXX
4)Reboot
Note: I suggest enabling system restore if ur using XP
Now u can install or run whatever you want.
GeekPress: How to beat the Napster ban
http://geekpress.com/archive/story/958142306.html
Unbooting Yourself From Napster
http://david.weekly.org/code/napster-metallica.php3