Dell Inspiron Zino (300, Late 2009) - Manual (Page 49)

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Restoring Your Operating System
In the event that System Restore did not resolve
the issue, you may undo the last system restore.
Undoing the Last System Restore
NOTE: Before you undo the last system
restore, save and 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.
Windows XP
Click 1. Start → All Programs→ Accessories→
System Tools → System Restore.
In the welcome screen, click 2. Restore my
computer to an earlier time.
Follow the instructions on the screen.
3.
Windows Vista or Windows 7
Click 1. Start .
In the 2. Start Search box, type System
Restore and press <Enter>.
Click
3. Undo my last restoration and click
Next.