Computer freezing every few seconds!

So I have Windows 7 first of all. But recently a power outage went down in the area. I think it may have affected this problem. But every few seconds my screen will freeze or starts being really slow. Most of the time I can still move the cursor but it doesn't do anything when I click or roll over things. I know I need to clean the dust from my computer so im about to do that. I think I may have pulled a cord because I just remembered the side of my computer fell off a few days ago as well. But please help, thanks!
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More about computer freezing seconds
  1. may help if you power on the computer and by hitting F8 choose safe mode is there lag anyway,can you access your pictures,music.
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