Remove Programs That You Don't Need  

• Click Start-Setting-Control Panel
  
• Once in the control panel, click Add/Remove Programs
  
• Go through the whole list, and remove programs that you know that you don't need. If you are not sure if you need a particular program, then don't delete it. You can go to the program itself and start it up and see if it is something you want to keep. If you have any of the following, make sure you get rid of them: Date Manager, Precision Time, Bargain Buddy, Comet Cursor.
  
• Getting rid of programs that you don’t need clears up space on your hard drive. It also stops un-needed processes from running which start and run when you start your computer, which slows down your computer.
  
• After getting rid of all un-wanted programs, reboot your machine to be sure that the remaining un-installed files and program have been removed.

Delete items in the "run" key in the registry.
Delete your temporary internet files.
Delete your internet history.
Delete your cookies.
Remove programs that you do not need.
Remove programs from your startup directory.
Install and run a spyware remover.
Delete your temporary files.
Defragment your hard drive.