CCleaner..

CCleaner is a freeware system optimization, privacy and cleaning tool for windows. 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 on
line activities such as your Internet history.

This was very useful to me.. since it deleted all the files with the dangling links....
These files exist in your system files, registry entries etc...
Whenever you install a software many files get created in your system folders. These files are created by the program that was installed and will be used by them, When you uninstall the program, some of these files doesn't get deleted and they remain forever in your system memory.We just cannot manually delete those files. They take up your harddisk space and sometimes they might also result in reducing the system's efficiency. Hence its always safe and good to get rid of them. This CCleaner does the same. Its a freeware with a size of about 2.82mb, just download the file and you go...

It has a simple and user firendly interface....
I have put some of the snapshots here...
In the main menu you have two options, first press on the analyze button, it will scan thru all your temporary files and list them for you. Then press Run Cleaner which cleans all the files listed....
In the registry tab... you have two options Scan Issues which scans for the issues and the second option to fix those issues....
It also has a tools tab which allows you to remove the unnecessary programs similar to your add or remove programs in the control panel....

It cleaned more than 400 Mb of space from my hardisk and my system now has faster at startup time...
use it

here is the link to download it

http://www.filehippo.com/download_ccleaner/

and enjoy...