Select safe mode with networking when you do F8. Go get Window Washer
http://www.webroot.com/consumer/products/windowwasher/ (on the bottom right is a link to try it for free) Then download free spyware programs like Ad adware, spybot, spydoctor. First run window washer to clean out any junk (spyware and stuff can store themself in temp folder) and redo a scan on norton and the other programs.