Dell Inspiron 15R (N5110, Early 2011) - Manual (Page 69)

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Restoring Your Operating System
System Restore
The Microsoft Windows operating systems
provide a System Restore option which allow
you to return your computer to an earlier
operating state (without affecting data files) if
changes to the hardware, software, or other
system settings have left the computer in an
undesirable operating state. Any changes that
System Restore makes to your computer are
completely reversible.
CAUTION: Make regular backups of
your data files. System Restore does not
monitor your data files or recover them.
Starting System Restore
1. Click Start .
2. In the search box, type System Restore
and press <Enter>.
NOTE: The User Account Control
window may appear. If you are an
administrator on the computer, click
Continue; otherwise, contact your
administrator to continue the desired
action.
3. Click Next and follow the instructions on
the screen.
In the event that System Restore did not
resolve the issue, you may undo the last
system restore.