Turn the computer on and tap on the f8 key after about a minute, you should get a screen with menu options, one of them will be safe mode. Select that and see if it boots.
If it boots sucessfully, I would go buy another hard drive and take the system to a repair shop (experienced in Raid 0 setups) and have them transfer the directory on your raid to the new drive.
I've never messed with a Raid 0 setup and I am rather dubious of what Dell gave you for Cd software--probably a ghost image which is no good for doing a repair from the command consol. In addition, in order to run
SFC /Scannow from the run line in safe mode, the cab files have to be on the hard drive. Dell usually installs them in the directory C:\Windows\Options\Cabs. If they are there or in the C:\I386 you should be able to run it..
You might be better off paying $200 to get a professional that knows Raid 0 to get you out of this mess.
Anybody else with some expertise on this issue, feel free to chime in-----No Dell Horror Stories!!!!!!

We don't have the space!