Hi there,
Please go
here to install the recovery console and for a guide on using combofix.
Please note: Installing the Recovery Console plays a vital part in making this process of cleaning your computer safe, don't overlook this!
Now please download combofix from
here or
here. It is important that you save this file to your desktop.
Double click
combofix.exe and follow the prompts. Please, never rename Combofix unless instructed.
When finished, it shall produce a log for you. Post that log and a
Hijack This log in your next reply.
A quick heads up, if you click on combofix's window when it's running, you may cause it to stall.