Trying to Format "C" drive

[andoyan]

Hello All,
I own a Sony Vasio desks top, I am trying to format the "C" drive, but every time I put the Utility Disc in I get this massage:
Cannot normally execute the initial setting of partition information.
This utility exits and your computer is rebooted.

can some one help?
thank You
Jon

 

[gbhall]

Are you actually booting off the utility disk, which you need to do - you cannot format the partition holding an OS in use at the time !

 

[andoyan]

Formatting "C"

Yes I am using the utility disk that came with the system
Thank You
Jon

 

[gbhall]

That is not a full answer - I asked are you booting off it?