Dell Studio 1558 (Early 2010) - Manual (Page 270)

270
Restoring Your Operating System
3 Click Exit if the
Install Windows message appears.
4 Restart the computer.
When the DELL logo appears, press <F12> 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.
5 When the boot device list appears, highlight CD/DVD/CD-RW Drive
and press <Enter>.
6 Press any key to Boot from CD-ROM.
7 Follow the instructions on the screen to complete the installation.