Dell OptiPlex 360 (Late 2008) - Manual (Page 48)

48 Reinstalling Software
NOTE: Depending on the region from which you ordered your computer, or
whether you requested the media, the Dell Drivers and Utilities media and Dell
Operating System media may not ship with your computer.
Reinstalling Windows
NOTE: The reinstallation process can take 1 to 2 hours to complete.
1 Save and close any open files and exit any open programs.
2 Insert the Operating System media.
3 If the Install Windows message appears, click Exit.
4 Restart the computer, and when the DELL logo appears, press <F12>
immediately.
If you wait too long and the operating system logo appears, wait until you
see the Microsoft
®
Windows
®
desktop; then, restart your computer and
try again.
5 When the boot device list appears, highlight Onboard or USB CD-ROM
Drive and press <Enter>.
This selection changes the boot sequence for one time only.
6 Press any key to Boot from CD-ROM, and follow the instructions on the
screen to complete the installation.
7 Reinstall the device drivers, virus protection program, and other
software.