|Boot into Safe Mode bye rebooting and as the computer begines to come back up tap the F8 key in 1 second intervals.|
When you get the boot menu choose Safe Mode with networking.
See if you can download the following programs and run them in the order I list them. (Do Not Reboot Inbetween RKILL And MBAM) If you cant download them in safe mode you will need to download on another computer and transfer using a flash drive or CD/DVD before hand.
RKILL ( a small script that should stop any malicious virus hooks preventing an antivirus from installing, do not reboot after running)
MBAM (Malwarebytes Antimalware- probably the best overall troajn rootkit removal program). Install/update & run a full scan. (Reboot if MBAM requires for removal)
CCleaner (this is a temporary file cleaner. Viruses of hide in the temp files and your AV's will miss them in there. Install ccleaner and open >. go to Options >> Advanced >> uncheck : Only delete files in temp folder older than 24 hours ... then click Cleaner button.
I would disable your antivirus while your running these programs. I would go and run an online scan ... ESET online scanner is good:
Lets us know how its going .... You may need to run a removal tool ..or 2 specific to the virus you have but this list above is a good start.