If your computer is running slow then consider using a program such as this one - ccleaner. http://ccleaner.com

It`s free, though a donation to the author is appreciated.

Quote:Last updated on 7th March 2007 New
Over 50 million downloads!!!

CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware!

Cleans the following
Internet Explorer
Temporary files, URL history, cookies, Autocomplete form history, index.dat.
Firefox
Temporary files, URL history, cookies, download history.
Opera
Temporary files, URL history, cookies.
Windows
Recycle Bin, Recent Documents, Temporary files and Log files.
Registry cleaner
Advanced features to remove unused and old entries, including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more... also comes with a comprehensive backup feature.
Third-party applications
Removes temp files and recent file lists (MRUs) from many apps including Media Player, eMule, Kazaa, Google Toolbar, Netscape, MS Office, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and many more...
100% Spyware FREE
This software does NOT contain any Spyware, Adware or Viruses.
What's New
v1.38.485 - [7th Mar 2007]
- Fixed resize crash at very high resolutions.
- Optimized Firefox cookie cleaning.
- Fix bug with language setting in INI file.
- Scanning performance tweaks.
- Updated several translations.
- Added support for IE protected mode cookies.
- Vista compatibility fixes.
- Minor bug fixes.

A new version has been released - v1.41.544