DLL Archive will clean up your system by getting rid of unused DLLs.

AnalogX DLL Archive is super-simple to use, just click search and let it do it´s thing - once done, you´ll be presented with a list of all the DLL´s that don´t have references in the system! Then just select which ones you think aren´t necessary anymore and archive them; it´s that simple! Make a mistake? No problem, restoring DLL´s from the archive is just as simple - nothing is deleted until YOU delete it.

Quick Uninstaller is a replacement application for Windows ´Add/Remove programs´ utility. With this utility, managing installed software become fast and easy. It allows you to display some available information about programs or updates and in some cases to edit uninstall commands.

LCleaner is a FREE tool to easily free up disk space from temporary, unwanted files, and clean system registry from unneeded registry keys. It is absolutely free and does not contain adware or spyware functions.
LCleaner is very easy to use just select the items you would like to clean and then press the Clean Selected button.

Auto-uninstall tool for the pre-release version of Microsoft .NET Framework 3.0.

For best results, install on a computer that has not had pre-release versions of Microsoft .NET Framework 3.0 installed on it. If your computer has a pre-release version on it, follow the Uninstall Instructions below to uninstall these pre-release bits before installing the Microsoft .NET Framework CTP. You must remove them in the correct order to ensure a clean uninstall.

While working, many computer programs and also Windows itself create a lot of temporary files. These files are not harmful in themselves, but they tend to accumulate and take up a lot of disk space. Also Windows will work slower than usual. Delete all temporary files spread on disks with some clicks!