The Windows registry is where programs register themselves with the operating system. Unfortunately, this can be bogged down by adware, viruses, or just too many programs and files. This is how you can clean up your registry and improve your computer's performance.
Step1
One of the good free registry cleaners I use is the Eusing Free Registry Cleaner. You can download this at http://www.eusing.com.Step2
After you download this you should install it, and then click the Scan Registry Issue link. This should bring up a list of all the broken registry items you have.Step3
Select all the problems and click Repair Registry Issue. This should clean up all the cruft. Your original registry would be backed up.Step4
After you clean up the registry you would need to restart.Step5
Another free registry cleaner that works well is CCleaner. You can download this at http://ccleaner.com. The steps to cleaning your registry is similar to the steps of Eusing. It is very easy to figure out. 
