Important: Please read this thread HERE before you decide whether to clean or reformat your system.
Should you decide to clean your computer,
please go ahead to Viruses/Spyware/Malware, preliminary removal instructions and follow the steps given.
Do follow all the instructions exactly. They will provide logs for analysis of your system so I will know how to instruct you to proceed.
Thereafter, please post
fresh HijackThis, AVG Antispyware and Combofix logs as attachments into this thread.
Do not copy and paste your logs if not it will be ignored and/or removed.
Also, please let me know the results of the AVG Antirootkit scan