Slowed Gaming PC

For a couple months now I have been experiencing latency as well as plain graphics issues. Before I was running WOW, HOTS, and a couple other games on ultra settings with little to no problem. Obviously dropping down the graphics in highly populated, dense areas. However, lately I can barely run them at low/good settings with extreme lag spikes at times. These is some information for some to look at. Any advice on speeding my computer up some would be greatly appreciated!
 

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You may have an issue with Windows update - check for failed updates.

You seem likely to have a heat issue... when did you last clean machine and renew thermal paste on CPU and GPU?
 
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