raman
2
That kind of Malware are Browser Hijacker. You can find some general infos of CWS Hijacker here:
http://spywareinfo.com/~merijn/cwschronicles.html
Or if you know on which side you were hijacked you could also take a look here:
http://www.wilderssecurity.com/showthread.php?p=179574
or use google.