Hi sugarx
First port of call is to contact your broadband provider, and explain the problem. Be at your computer at the time as they may want to talk you through trying something. Don't know who your provider is, but if you get a helpful and knowledgeable helpline supporter answer the phone (this is pot luck), then they are pretty good and the serviced they provide is getting better.
If still no joy, then you may have to do a reinstall of the whole lot, as their is a good chance you are infected. Not the end of the world, providing you are able to back everything up first. Let me know how you get on, and if you want some tips on A/v software if you reinstall.
http://www.daniweb.com/techtalkforums/newreply.php#
LOL