Make sure you have all of the following before you take any action.

A driver backup: See "" for instructions.

Backup media and software: You'll want an external hard drive (or better yet, two of them), some blank DVDs, and backup software. I'll cover more details in Steps 3 and 4.

Your applications: For every program you use that didn't come with your PC, you need the CDs they came on, their serial numbers, their registration codes, and so on. If you downloaded an application, make a backup of the download file or check to be sure that you can easily download it again.

Time: In reality, this project will probably take only a few hours, but you want to leave yourself a day of wiggle room in the event that you can't locate an important driver or software disc. This project is best tackled at the start of a long holiday, or at least over a weekend, to avoid disrupting your business if something goes wrong.