I would use Grif's great advice here. http://forums.cnet.com/7726-6122_102-5509131.html?tag=posts;msg5530654
All day I have been getting weird stuff on my computer.....started out with the "warning....poor perfiormance..security may be affected " crap........then I started to get my own security program telling me that many of the websites I use (newspapers etc...could be fraudulent and that I should not go there)....NOW it has changed again to "message from webpage" telling me that my firewall, anti virus etc need to be checked...and that I need to call a certain number./..alleging to be Microsoft..
Any suggestion as to how I M IGHT be able to rid myself of this garbage???