Dell Studio 1558 (Early 2010) - Manual (Page 267)

Restoring Your Operating System
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Windows XP
1 Click Start → All Programs→ Accessories→ System Tools→
System Restore.
2 Click Undo my last restoration and click Next.
Enabling System Restore
NOTE:
Windows Vista does not disable System Restore; regardless of low disk
space. Therefore, the steps below apply only to Windows XP.
If you reinstall Windows XP with less than 200 MB of free hard-disk space
available, System Restore is automatically disabled.
To see if System Restore is enabled:
Windows Vista
1 Click Start → Control Panel→ System and Maintenance→ System.
2 In the left pane, click System Protection.
3 Click the System Protection tab. Ensure that the System Protection for
the hard disk is unchecked under Automatic restore points.
Windows XP
1 Click Start → Control Panel→ Performance and
Maintenance → System.
2 Click the System Restore tab and ensure that Turn off System Restore is
unchecked.
Using Dell™ PC Restore and Dell Factory Image
Restore
NOTICE:
Using Dell PC Restore or Dell Factory Image Restore permanently deletes
all data on the hard drive and removes any programs or drivers installed after you
received your computer. If possible, back up the data before using these options.
Use PC Restore or Dell Factory Image Restore only if System Restore did not resolve
your operating system problem.
NOTE:
Dell PC Restore by Symantec and Dell Factory Image Restore may not be
available in certain countries or on certain computers.
Use Dell Factory Image Restore (Windows Vista) or Dell PC Restore
(Windows XP) only as the last method to restore your operating system.