Virus Removal Tool

use the following programs

spybot search and destroy.(get rid of bad cookies,and spyware and ad ware)
http://www.filehippo.com/download_spybot_search_destroy/
the latest version has a real-time anti-spyware protection in all browsers.

http://www.filehippo.com/download_spywareblaster/

this is used for simply preventing anything from getting inside your computer.this doesnt remove anything,it is simply an anti-spyware firewall.

that sounds about right.with all these programs youll boost your protection in your browser.the reason why the bad viruses and ad ware keeps coming back is because of your firewall probably.use comodo firewall.i use it and all my ports are closed,which means nothing can get in.
http://www.filehippo.com/download_comodo/

this is a very powerful firewall.i also say to get firefox instead of internet explorer.ie lets to many things slip through
http://www.filehippo.com/download_firefox/

now after youve installed all of these programs you should be pretty secure now.NOTE:before you search for viruses or spyware on your computer i suggest to update the definitions,that way you can get most of the bad stuff out.feel free to add more details or e-mail me for anymore help.

EDIT:you can also use spywareblaster.again its another program used to prevent the installation of spywaare.the more anti-spyware programs you run,the better.because not only one program gets everything.you need a decent amount of programs to catch stuff that the other one left behind.

http://www.filehippo.com/download_spywareblaster/

Free anti virus (it is a good one) http://www.free-av.com

Free antispyware … http://www.safer-networking.org

AVG Free is grisoft.com. It has anti-virus and anti-spyware programs that are free, and work very well. Spybot is also good for spyware, and is also free.