One last check for malware before we go into some generic Windows troubleshooting.
Download and Save
Blacklight to your desktop:
Double-click
blbeta.exe then accept the agreement, leave [X]scan through Windows Explorer checked, click > scan then > next
You'll see a list of all items found. There will also be a log on your desktop with the name fsbl.xxxxxxx.log (the xxxxxxx stand for numbers).
Copy and paste this log in your next reply. Don't choose the rename option yet! I want to see the log first, because legitimate items can also be present there, such as "wbemtest.exe"