Disk Defragmenter wont analyze

I am running two Sata drives in a Raid 1 array and I have just opened
up Disk Defragmenter to check my C and D drives.

When I highlight the C partition and click on the analyze button a box
pops-up with the following information:-

"Disk Defragmenter has detected that Chkdsk is scheduled to run on the
volume : (C:). Please run Chkdsk /f.".

I assumed that when shutting down my system and rebooting that Chkdsk
would run automatically before going into Windows but it doesn't.

I have no idea how to proceed, can anyone please advise me how to get
Chkdsk to run in order that I can then use Disk Defragmenter.

Thanks.

Agzee



.