Dear Judy,
Thanks for your help and guidance, I have uninstalled all the scanners used earlier including combofix according to the instructions you have provided.
I had forgot to mention in my earlier post that I have already installed Spywareblaster with all protections enabled. I have enabled system restore as per your instructions.
I will definitely install SP3 and I am also marking this thread as solved.
I would again like to thank you for your support and guidance that you have provided while solving my issue, in future I will make sure that I post my problems only in one forum and will give it time before posting in another forum.
Thanks for your help and time
Punit