What might be going on is problems with your security programs.
Spybot anti-virus

Windows defender will be disabled with other antivirus features on a computer.

To rule out infection we can run a anti-rootkit scan.

Follow the instructions in the thread below to run a scan with MBAR. Don't forget to update the database before launching the scan, and once launched, leave MBAR running and do not touch your computer until it is done scanning.


Once MBAR is done scanning, removing threats and rebooting your computer, go in its MBAR folder, and copy/paste the content of the mbar-log-TODAYS-DATE.txt log in your next reply.