You need to think this through.
- You are trying to format C:
- You are using C:
- like anything logical it will refuse to attempt to format/delete itself as that would mean it also deletes the instructions to delete...
As it is a Dell, have you thought of restoring it back to Factory Fresh ?
That will be a darn sight easier than reinstalling XP and all this lot click here
Here's your manual click here
Factory Restore: press the key before the Windows logo appears on the screen. If you press F8 after the Windows logo appears on the screen, the Advanced Boot Options menu will not appear on the screen. If you do not see the Advanced Boot Options menu, restart the computer, and then repeat this step until you see the menu on the screen. Follow the on screen instructions
That will wipe the drive and restore it back to how it was when first left factory.
These are the instructions for the XPS ClickHere
To restore your computer to the original factory installation, follow these steps:
- Turn on the computer, after the Dell logo press F8 key repeatedly until you see the 'Advanced Boot Options' menu (Advanced Startup Options).
- In Advanced Boot Options, highlight Repair Your Computer and press Enter.
- Click Next and logon to the administrator account in the computer.
- Click Dell DataSafe Restore and Emergency Backup and DataSafe Options.
- Choose Restore without preserving new or changed file. Click Next to continue.
- Choose Yes and click Next to continue.
- Progress status will appear. Click Restart to initiate the restoration process