Dell Studio XPS 8100 (Late 2009) - Manual (Page 57)

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Restoring Your Operating System
NOTE: If you wait too long and the
operating system logo appears, continue to
wait until you see the Microsoft ® Windows ®
desktop; then, shut down your computer
and try again.
NOTE: The next steps change the boot
sequence for one time only. On the next
start‑up, the computer boots according to
the devices specified in the system setup
program.
When the boot device list appears, highlight 6.
CD/DVD/CD-RW Drive and press <Enter>.
Press any key to
7. Boot from CD-ROM.
Follow the instructions on the screen to
complete the installation.