Hello,
The most common scenario for this is that the operating system itself is using the drive. For example you can't FORMAT C: if Windows itself resides on or is using C:. The only way to format a drive in use by the system is to reboot, usually from floppy, so the system isn't running. Be careful - this usually means you are wiping out your system - I'm assuming that's what you want. You should also checkout the web http://www.techyv.com/questions/i-cant-del...ile-my-computer

This post has been edited by asaiful99: Oct 7 2011, 11:01 AM