Hello and Welcome to TSF
Download and install:
HiJackThis.
(Always create a Folder for HiJackThis anywhere but your Temp/Temporary Internet Folders or Desktop. A good place to make a folder would be in My Documents, as this is where it will save the backup files needed if there's a problem.)
Then doubleclick HijackThis.exe, and hit "Do A System Scan And Save Log". Make sure all Windows and Browsers are closed.
When the scan is finished, best to save your text file in the same folder as where you put HiJackthis.
Copy/Paste the info from your saved Hijackthis log file into this thread.
A Moderator/ Security Team Expert will give you instructions.
***DO NOT TRY TO FIX ANYTHING, MAJOR DAMAGE CAN BE DONE TO YOUR SYSTEM IF THIS TOOL IS USED INCORRECTLY, PLEASE WAIT FOR AN ANALYST/MODERATOR TO GIVE YOU INSTRUCTIONS***