The Grub message is a clue that the disk had or has Linux on it
Googling indicates this PC probably has a 160GB sata hard disk with XP
Windows sometimes can not clear previous Linux partitions
How did you clear partition using BIOS ? (not a common option)
one possible option in BIOS to turn off is the write protection of first cylinder or sector of hard disk
You need a tool capable of clearing partition cylinder or MBR before installing Windows.
Most of the ones I know need a Cd/DVD drive (even a external usb version) .
Examples DBAN or Seagate disk diagnostics (available as ISO CD images)