Dell Vostro 1500 Owner's Manual page 152

For more information:
1 Click the Windows Vista Start button
2 Type System Restore in the search field and press <Enter>.
Restoring the Computer to an Earlier Operating State
If problems occur after you install a device driver, use Device Driver Rollback
(see "Using Windows Device Driver Rollback" on page 146) to resolve the
problem. If Device Driver Rollback does not resolve the problem, then use
System Restore.
NOTICE:
close all open files and exit any open programs. Do not alter, open, or delete any
files or programs until the system restoration is complete.
1 Click the Windows Vista Start button
Maintenance→ Back Up and Restore Center.
2 In the Tasks list, click Repair Windows using System Restore.
3 Click Continue in the User Account Control (UAC) dialog box asking for
permission to run the application.
4 Click Next in the System Restore window to view the most recent restore
points in chronological order.
5 Select the Show restore points older than 5 days check box to view the
complete list of restore points.
6 Select a restore point. Try to restore from the most recent restore point. If
this restore point fails to correct the problem, try the next oldest restore
point until the issue is resolved. Any software installed after the selected
restore point will need to be reinstalled.
7 Click Next→ Finish.
8 When prompted, click Yes.
9 After System Restore finishes collecting data, the computer restarts.
10 After the computer restarts, click OK.
To change the restore point, you can either repeat the steps using a different
restore point, or you can undo the restoration.
If you encounter any error messages during the restore process, follow the
prompts on the screen to correct the error.
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Troubleshooting
Before you restore the computer to an earlier operating state, save and
→ Help and Support.
→ Control Panel→ System and