Do you have an administrative account or the password for an administrative account? If not, you're out of luck...
Yes i think so ??
Well then sign on using that account and password and you'll have administrative privileges!
There are some things that even an administrator can't do. For example, you can't delete a file that is locked by a running program - you have to stop the program first. You can't run CHKDSK /f on a disk that has files open - you have to reboot to safe mode and make sure nothing's using the disk. The OS drive ALWAYS has open files on it, so the only way to handle it is to schedule a CHKDSK to run at the next reboot before the OS has fully loaded.