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Thanks Keith Advanced Windows files CCleaner can remove these advanced Windows files: Old Prefetch Data - (XP only) To run quickly, Windows uses prefetch files to store information about programs that you frequently use. The Cleaner deletes old prefetch data for programs that no longer exist or haven't been used in a long time. Menu Order Cache - When you drag and drop items on the Start menu into different locations, Windows stores this information in the Menu Order Cache. Tray Notifications Cache - This cache stores information about any items that have ever appeared in your System Tray, and whether or not you have set them to Hide, Hide When Inactive, or Always Show. Window Size/Location Cache - When you open and close Windows Explorer, Windows records folder settings for window position, sort order, columns, folder type, toolbar toggles, and search result views. User Assist History - User Assist History is a built-in monitoring feature of Windows that records when you access programs, shortcuts, Control Panel applets, and possibly even Web sites. IIS Log Files - Microsoft's IIS server keeps logs of its activities on your system. Hotfix Uninstallers - (XP only) Every time you download and run a Hotfix from Microsoft, Windows stores an uninstallation program for that Hotfix on your system. Custom Files and Folders - This setting relates to CCleaner rather than any part of Windows. If you select Custom Files and Folders, CCleaner will use the information in the Include and Exclude part of its Advanced section to add or ignore files, folders, and Registry keys while cleaning.

As recommended I check all the boxes except the advanced options. Every review I had read skip over the advanced options as well. Can some tell me what checking each of the advanced options does along with the positive and negative results of checking them? Old Prefetch data Menu Order Cache Tray Notifications Window Size/Location Cache User Assist History IIS Log Files Hotfix Uninstallers Custome Files and folders I have searched this forum but have not found the answers. Thank you

Microsoft collects files in the standard history files which can be removed easily. But there is another location that Microsoft saves deleted emails and history that can only be found in DOS and cannot be searched for. Does CCleaner remove those files as well? I know it is used to catch bad people; but most of us are not bad people. I would like to remove those extra files to keep my computer running smoothly.