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#21
Its worth updating your softwares especially Java and remove the older ones, you can use Java's own tool from here.
Do you receive any problem errors from the Action center?
Have you used Windows troubleshooting menu? Troubleshooting
Now that is bugging you for so long I would say remove your antivirus and use a different one, I suggest using Avast, its very stable and runs smooth. Previously I had performance issue after I installed Comodo firewall, but after removing it, those problems were solved. Its worth trying another antivirus and run a full scan by Superantispyware and Ccleaner.