Mr. dB said:
Most laptops have some proprietary software on them that didn't come bundled with Windows from Microsoft, the manufacturer adds their own extras and includes them on the restore disc. These are the little goodies you usually see down in the System Tray in the lower right corner of the screen, by the clock. Things like a battery meter. And mfg-specific help files. Isn't there like a Dell Help Desk or something that has hardware-specific help information? Surely it's not just a plain-vanilla Windows installation.
Did the system come with any written documentation? A small manual? A few cut sheets with instructions? Did you read any of them? One of them would explain how to restore the system in case of a problem. If you didn't get a CD with the system, then they HAD to include that stuff on the hard drive.
What size is your hard drive supposed to be? And what size does Windows say it is? Is there, say, about 700M-1G missing? Like, if your hard disc is supposed to be 20G, but Windows says that your C:\ partition is only 18G? That extra missing space is taken up by the contents of a Windows restore CD hidden on your drive. There should be instructions on how to get to it, either in the printed documentation that came with the system, or in the Dell help desk stuff that should be installed in Windows. It's usually a matter of holding down one of the F keys when you boot the system.