The best way to do that is by doing a factory recovery which will re-install what was on the computer when it was first purchased. Remember to copy your data to another drive or to DVD/CD before doing the recovery as it will erase everything that's currently on the hard drive.
The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Compnet Ventures, LLC hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.