How can I be sure now that I no longer work for a certain company that they are not accessing my computer from their side. Strange things happen ( someone remove a certain set of my friends on Facebook, then put all but one back). I also see the screen flicker like when you are getting online help. Please help if you can.
closed as unclear what you're asking by TildalWave, Lucas Kauffman, Xander, Adnan, Terry Chia Dec 27 '13 at 4:45
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First of all if this is your personal computer and you have serious suspicion someone is abusing your computer, file a complaint with the police. Accessing your computer without your consent is considered a crime in most countries.
If your employer did not have access before to your computer, chances are you are the victim of computer criminals. Here as well file a complaint with the police.
Then the best thing you can do is reinstall your computer from the ground up. You can backup your files though, just not the executables.
You should change all your passwords immediately. Not sure about how to secure your computer, to be safe maybe a reformat will be good?
However, to confirm that your Facebook account has been really accessed by someone else, Facebook has an extensive monitoring account activity feature which you can use (read page 9 of guide).
Hope it helps!