i have a new icon in my toolbar that if you mouse over says virus alert, if you click on it a new page opens at this url. it also has this annoying box that pops up randomly that says your computer is infected blah blah blah, i have tried everything i know and cant get rid of it. does anyone have any advice?

Please follow the instructions HERE & then post your log in a new thread in the Spyware, Adware, Viruses and HijackThis Logs section.
(Not in this section please).