If direct click “Run Cleaner” (or select it by right clicking at Recycle Bin), the program will immediately delete the files. If you want to know what it will delete, then click “Analyze” first before “Run Cleaner”.
Note that in “Applications”, if “RegEdit” is checked, CCleaner will clean up the registry as well. You may want to do it separately (in “Issues”).
Clean up your registry. After you uninstall some software, the uninstallation always leaves something in your registry file. In the long run, the file contains lots of garbage, so clean it up every time after the uninstallation. If you’re concerned about the fixes, you can backup the to-be-removed registry entries first and then restore them (by double clicks) later if encountering some problem. However, I have never had that kind of problems.
(1) Uninstall: a list of softwares installed in your PC, which can be uninstalled here.
(2) Startup: a list of programs running at the start up, which can be removed here.
You can customize the settings of CCleaner.
Clean Up Windows Updates:
Even after Windows SP2, the Windows XP have installed tons of updates in your PC (if you set the automatic update ON — no matter which option). They also have uninstallations just in case you want to uninstall for some reason (conflicts etc).
However, have you ever uninstalled them? No, right? Then it’s just a waste of your hard drive space (check out the total size of these files, and then you’ll know what I mean).
This is what I’d do:
I delete the update folders that are at least two months old (if I have any need to uninstall them, it won’t take more than two months to know). Then I run CCleaner’s “Issues” to clean up the registry.
Of course, this can be done by CCleaner (check “Hotfix Uninstallation” under “Advanced”, but I prefer to do it in this way (just for the safe side).