Hello there and welcome to BleepingComputer.
Since I do not know the full extent to which you are infected, I do not think it is appropriate to offer advice on whether or not to reformat your computer, but based on your descriptions I do not think that it is necessary. Formatting should only be used if there is no way to remove the infections from your computer, or if sensitive data is at risk. Obviously this is quite a long process to carry out, so in your case I would advise to try to clean the malware first before resorting to formatting. However, if you would like to read more about doing this, take a look at the following page:When Should I Format, How Should I Reinstall?
Now, on with the cleaning ...
Firstly, we will try following a self-help guide to try to remove the infection from your computer: How To Remove Smitfraud, Self-Help Guide
If this does not solve the problem entirely, follow our Preparation Guide For Use Before Posting a HijackThis Log
; running all of the scans before posting your HijackThis log. Do not post your log here, but instead use our HijackThis Logs and Analysis Forum
After posting a log you should NOT
make further changes to your computer except those that are advised by a member of the HijackThis Team; doing so can cause system changes that may not be visible in your log. Please be patient whilst waiting for a response, our HJT Team is currently very busy, and as we try to deal with logs on a "first come first served" basis, you may have to wait a short while.
If you have any problems carrying out these steps or require additional information, just ask and we will do our best to rectify them for you.
Edited by rookie147, 11 September 2007 - 11:31 AM.