Dell Studio 1435 (Late 2008) - Manual (Page 46)

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Restoring Your Operating System
Restart the computer. 4.
When the DELL logo appears, press 5.
immediately.
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 .
Press any key to
7. Boot from CD-ROM.
Follow the instructions on the screen to
complete the installation.