In addition to jeffrow's comments, dl Spybot S&D, CWShredder and HijackThis: -
Spybot S&D also has the ability to lock the Hosts file as read-only in order to prevent further browser hijack attempts.
http://www.safer-networking.org
http://www.net-integration.net/reviews/spybot2.html (Tutorial
http://209.133.47.200/~merijn/downloads.html
http://209.133.47.200/~merijn/downloads.html
Install them, update them, regularly, and run Spybot S&D and CWShredder every day.
IRO HijackThis, run it and post your log in the following forum and somebody will look at it and advise you accordingly, re: browser hijacks, spyware, adware, malware, etcetera.
http://www.spywareeliminator.com/for...p?showforum=13
It would also do no harm to dl, install, update accordingly, and run the following free apps as well: -
http://www.javacoolsoftware.com/spywareguard.html
http://www.javacoolsoftware.com/sbdownload.html
And do not forget, always utilize a quality AV and Firewall, both properly configured and updated at all times, as well as scanning your pc with an on-line scanner, as some virii are designed to disable your installed AV.
A NAT enabled Firewall router, combined with all of the above, would be even better. An ounce of prevention is worth more that a pound of cure.
http://www.pandasoftware.com/actives..._principal.htm
-=JAZZ=-