Does your machine have a restore partition?
Systems shipped after July 15, 2004 came with Symantec PC Restore. This utility restores the computer to an "as-shipped" condition. If you haven't reformatted, repartitioned, or otherwise modified the master boot record, it should work.
If the Symantec PC Restore utility won't work, but still resides on your computer, a Dell customer has figured out some ways to get it to work again. Note - If you removed this partition, it is not recoverable, cannot be downloaded from the internet, and cannot be shipped from Dell. Click here for ways to fix Symantec PC Restore. Users have also reported that the partition can be restored with Ghost 2003, and Ghost 9 using the '03 capabilities of it. If you boot to the Ghost 9 CD, select Advanced Recovery Taks, select Utilities, then Restore Legacy Image it should work - but you want to verify the image before attempting the restore. It's in a folder called IMG.
Systems that shipped beginning in early 2005 ship without Windows XP. You can contact Dell and request a CD and wait for it to ship, see Contact Us at the bottom of the page. And you'd need the other CDs from Dell or you can't reinstall that particular piece of software.
Using PC Restore in Windows XP or Media Center
1 Turn on the computer.
2 When the Dell splash screen appears during the computer startup process, press and hold <Ctrl> and then press <F11>. Then, release both keys at the same time.
3 In the Dell PC Restore by Symantec window, click Restore. Alternatively, press <Tab> to highlight Restore, and then press <Enter>.
4 When a warning message appears stating that all data will be lost, click Confirm, or press <Tab> to highlight Confirm and then press <Enter>.
The Progress window will appear. Once the restore process starts, Dell PC Restore by Symantec usually takes about 8 to 10 minutes to finish.
When the restore process is complete, the following message will appear:
The system recovery process was successful.
5 Click Finish or press <Tab> to highlight Finish and then press <Enter> to restart the computer.The software is now installed as it was when the computer was first received.