Dell Dimension 4550 - Manual (Page 71)

Advanced Troubleshooting 71
If Device Driver Rollback does not resolve the problem, then use System
Restore (see page 68) to return your operating system to the operating state
it was in before you installed the new device driver.
Reinstalling Windows XP
To reinstall Windows XP, perform the steps in the following sections in the
order in which they are listed.
The reinstallation process can take 1 to 2 hours to complete. After the
reinstallation is complete, you will need to reinstall the device drivers, virus
protection program, and other software.
NOTICE: The Operating System CD provides options for reinstalling
Windows XP. The options can overwrite files and possibly affect programs
installed on your hard drive. Therefore, do not reinstall Windows XP unless
instructed to do so by a Dell technical support representative.
NOTICE: To prevent conflicts with Windows XP, disable any virus protection
software installed on your computer before you reinstall Windows XP. See the
documentation that came with the software for instructions.
Preparing to Boot From the Operating System CD
1 Insert the Operating System CD into the CD or DVD drive.
2 Exit any program or utility that might run after you insert the CD.
3 Shut down (see page 33) and restart the computer.
4 Press <F12> immediately after the DELL™ logo appears.
If the operating system logo appears, wait until you see the Windows
desktop, and then shut down the computer and try again.
5 Use the arrow keys to select CD-ROM, and then press <Enter>.
6 Press any key when the Press any key to boot from CD message
appears on the screen.
Starting Windows XP Setup
1 When the Windows XP Setup screen appears, press <Enter> to
select To set up Windows now.
2 Read the information in the Microsoft Windows Licensing
Agreement screen, and then press <F8> on your keyboard to accept
the license agreement.