It is probably a in the wild virus, stuff that just came out. Or "Zero Day" viruses, samething different name.
Dont waste time worrying about it, just act.
Download these
Malwarebytes
Avast Free Anti Virus
Spybot Search & Destroy
Spybot is all free and the other two are trials but are basically the same as the paid versions.
If this "virus" wont let you download or run these, just restart your pc in safe mode with networking. Press F8 as soon as your pc starts to power up. press it over and over. May take a few restarts.
Update the programs, then run each one one by one. This should clear the problem. If you have enough ram, enable Malwarebytes protection module if you paid for it, and also enable Spybots "TeaTimer". TeaTimer protects your registry. Your registry is basically critical system files and settings, like windows system 32. (What most infections attack to gain control over your pc)
This is a powerful combo I personally use (all paid versions of course) and I put it on all my friends computers when there messed up.
This will clear your problem up and keep you safe. Update regularly by the way.