via - PCWorld
System Restore allows you to roll back your computer settings in case you've installed software that causes PC instability or sluggishness. System Restore will not affect personal files such as e-mail, documents, or photos. By loading Windows from a restore point, you can undo the negative effects of bad drivers and updates.
Step by Step: How to Run System Restore
Step 1 Within the Start menu, click All Programs.
Step 2 Go to Accessories, System Tools, System Restore.
Step 3 Run System Restore using the Recommended Restore option. This will undo the most recent software installation, which can include updates and drivers that you added in the past few days. This option works well if you recently installed a piece of software and immediately noticed a problem.
