You have a worm. Uninstalling LW's not going to fix it.
Try the easy fix mentioned at the end of point 2 here...it's worked for heaps of people.
WARNING: Viruses on the network you should be aware of

If that doesn't help, there are links to help sites below
Spyware Warrior :: Index
CastleCops® » Security Forums
http://forums.spywareinfo.com/index.php?showtopic=79038

Always make sure that you're using a good AV program. Keep it updated & scan all files that you've downloaded before you open them.