caps in forums kinda suggests shouting.
about your problem, simply format drive D as drmsucks mentioned, this will erase everything on D.
friny, by boot menu interface, do you mean the windows bootloader? yea, you will want to erase the windows server boot entry from the boot loader.
If you would like to "uninstall" xp, just format c drive, erasing everything on drive C.
if you want to do so without any existing OS, just use a bootable drive format utility, such as acronis, or partition magic.