1. | Log on to Windows as Administrator. |
2. | Click Start, point to All Programs, point to Accessories, point to System Tools, and then click System Restore. System Restore starts. |
3. | On the Welcome to System Restore page, click Restore my computer to an earlier time (if it is not already selected), and then click Next. |
4. | On the Select a Restore Point page, click the most recent system checkpoint in the On this list, click a restore point list, and then click Next. A System Restore message may appear that lists configuration changes that System Restore will make. Click OK. |
5. | On the Confirm Restore Point Selection page, click Next. System Restore restores the previous Windows XP configuration, and then restarts the computer. |
6. | Log on to the computer as Administrator. The System Restore Restoration Complete page appears. |
7. | Click OK. |
More info can be found at the following Microsoft Knowledge Base (KB) http://support.microsoft.com/kb/306084/