First thread :)
Anyway...lets get down to business.
Q)My computer is slowing down! Why? How do I fix it?
A) This can be caused by a large number of things
-Scan your computer for Spyware. If you need help on what to use to scan for spyware, try Spybot:Search and Destroy
To avoid having spyware come back, be careful about what you download and don't visit sites that aren't safe. Generally, unsafe sites have lots of popups and ads.
-Defragment your hard drive (And do so every month or 2)
-Clear useless files and/or programs that you don't use anymore
-If you haven't cleaned out your computer in a while (if ever), open up the side and blow the dust off the components and vacuum the dust that falls to the bottom of your case. Then use canned air to blow any caked in dust that may have accumulated in your CPU's heatsink. Then suck the dust you blew out.
How does dust slow your computer? Processors since Pentium 4 throttle (lower "ghz") when they reach a certain temperature in order to prevent burning.
Sometimes the dust buildup causes so much heat that your computer can automatically shut down (thanks HiiEN)
-Use disk cleanup (Right click your C drive in "My computer" and select "Properties"
There should be an option for disk cleanup.)
-CCleaner is a great program to use (Thanks Greg)
-Check your disk for errors (Thanks Lyssa)
Hopefully, your computer will be faster after you do these things.
Taking suggestions for more things to do to speed up computers