clear the MBR after FC4 removal

[lorenzo.sandini at pp.inet.fi]

Hi,

Moving my FC4 install to a bigger machine, and recycling the old computer to 
be a windows xp desktop computer.

Booted from the WinXP CD, formatted the whole drive, and hoped the MBR would 
be overwritten and clean, but it is not.

On reboot, I am offerend to choose between Win XP and "former OS", which 
obviously needs nowhere.

fdisk /mbr doesn't do a thing. How can I get rid of the reference to the 
former OS in the boot menu ? I know I can edit the boot.ini, but is there any 
trace of FC4 on the HDD that needs to be cleared ?

Lorenzo