GRUB is installed in the MBR (Master Boot Record).  In order to get rid of 
it, use the following command from a dos prompt (ms-dos boot floppy)
   fdisk /mbr 
Explanation and more info at (among a thousand other places):
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q69013
Stuff like this is easily searched on google... 
 -Ken 
Mikes work account writes: 
> 
> I have been told to change one of my Linux workstations to an NT workstation
> for an additional employee.  I have tried everything but each time I load NT
> and reboot I get a GRUB> prompt.  How in the world do I get rid of GRUB?? 
> 
> I have formatted and deleted partitions for the past 3 hours with not
> success in getting rid of that prompt. 
> 
> Michael C. Rock 
> 
 
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