And while you're at it, drain your car battery and rinse it out several times, then fill it up with distilled water.....don't forget to check the muffler bearings and replace the stale air in the tires with fresh, bouncy air.
My advice was serious. The OP could have a rootkit and does not have the knowledge to remove it. In fact, there are now malware that install to the flash on the HDD itself. Since hard drives are dirt cheap, better to just start fresh and junk the old one.