Help please my computer has become extremely slow.

From some days my computer bas became very slow generally. It takes a long time in startup, hangs when i try to open a folder. It has became unusable. I am facing problems since i installed my ati radeon hd6670. Earlier i had a core 2 duo E7400 2.80ghz, 4 gigs ddr2 ram, 400w psu, it has 17V running through the 12A rail. I doubted that it was my psu but when i ran my pc on on-board graphics and removed the hd6670 it still was running really slow. I am thinking to reinstall windows. Help please.
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More about computer extremely slow
  1. the Graphic cards drivers may have caused it you should try reinstalling them and if it dosent work then reinstall windows
  2. it could be a virus problem scan your pc with a good antivirus software .....turn off unnecessary start up programs defrag your hdd remove temporary files if all these fails then do a complete format and reinstall your os ...
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