Wired Child

Here my problem.. I just installed Diskeeper 6, and I have set it to do a Boot-Time Defrag. To do this MS whistler needs to do CHKDSK /F, but won´t. So everytime I try do evan a normal defrag on the C: drive, its just says that CHKDSK/F is scheduled to run, and prevents me from defraging... I tried to reinstall diskeeper, but no luck...Plz help BTW I´m running Windows Whistler Pro Build 2296 (beta1)