If your computer is slowing down and it takes a long time to reboot, a Clean Install will probably not help that much. Before doing that, test the Health of your HDD. Download DiskGenius in my signature. Select your disk and go up to the toolbar to Disk/View SMART Information. This will give you an overall snapshot of your HDD. it has a Yellow Caution button, then go to View or Repair Bad Sectors/Verify. This will take a long time, if there are any Bad Sectors on your drive, you should replace the drive ASAP. If all the Sectors are Good or if SMART says it is Good then proceed with a Clean Install.
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