Malware Win32/Gamarue is going around!
Manually run Windows Update and Virus/Malware Updates ASAP. Keep going back and checking for updates until there are no updates available, check one more time, reboot, check again, reboot and check one more time. Then run a full system scan.
This malware family can give a hacker control of your PC, steal your info, change your security settings, even install other malware. Also it can spread by infecting removable drives e.g. USB flash drives & portable hard drives. Google Worm Win32 Gamarue for more info.
If you find it, and you are sure it is eradicated, change your passwords everywhere.