Thanks, but i've already done that about a week ago. Its only after i cleaned out the dust that this problem has started, but my computer is running at a far lower temperature and isn't as loud as it was before. I don't think my new problem is related for some reason.

Okay 'Running slow' could be any number of things it's a process of trial and error and little things that make all the difference.

• Virus scan in safe mode
• Do the prework
  • Post logs in the HijackThis section of the site
  • Clean up anything bad lurking in there
• Install driver updates and windows updates
• Defragment your drive using windows defrag tool or a third party tool such as IOBit Smart Defrag I recommend it as it does a very good job and can be configured to defrag on the fly in the background, meaning you will very rarely have to do it again
• Clean the cache, use something such as CCleaner as well as disk clean up
• Review start up items
  • Remove any start up items you don't use oftern
• Review running services
  • Remove any unused/not needed services, Blackviper's guide is very good
• Set up scheduling for 'routine maintenance'

If you are unsure about any of this, just ask and I'll be glad to help