System Inspector
by R.M. de Boer Software

  Keep your PC running faster, cleaner, and error free! Protect your privacy and improve your PC’s performance! Scan all your harddisks for obsolete files and optionally remove them.
Clean Recycle Bin, Temporary folder, Cookies, Temporary Internet files, Windows History folder, Recent Documents folder, Internet Visited History, Internet Cache, Find Files/Folders history, Computer History, Start -> Run History, Typed URL's history, WINZIP history, Media Player History. Add/Remove/Disable/Change all startup items. Scan and clean registry for invalid recent files, invalid shared DLL's and other references. View, manage and/or delete all cookies on your system. View size of all folders/subfolders of your harddisk in Explorer style.
...and much more!

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optimize windows, clean up registry, delete unneccessary files, computer performance, optimize xp, system, ...