Use System Restore !!!

System Restore is one of those programs that can be a life-saver when you've been the unfortunate recipient of unstable software, a badly timed power outage, or a damaging thunderstorm. System Restore records important documents, settings, and preferences on your computer. If the unthinkable happens and your computer files are damaged or inaccessible, you can use System Restore to restore your computer back the same state it was in before the data was lost.

System Restore creates restore points daily, and whenever you install device drivers, automatic updates, and some applications. Still, it's a good idea to get into the habit of creating a system checkpoint (called a restore point) whether you're about to install new software, or take any action you suspect might make your computer unstable. That way, if there's any conflict at all, you can restore your computer to the point just before you began the installation.

To use System Restore:

1.Click Start, and choose All Programs.

2.Point to Accessories, then point to System Tools, and then choose System Restore.

3.When the program begins, choose Create a restore point and click Next.

4.Enter a description of the restore point and click Create. After a few seconds, the program will tell you the date, time, and description of the new restore point.

5.Click Close to exit System Restore.