|Let me guess...another person completely wiping their HDD because of spyware?|
What kinda boot floppy are you trying to use? You can't format an NTFS partition using a Win98 or WinME boot floppy.
Have your g-friend go into the BIOS & change the boot order so that CD-ROM is the 1st boot device, then have her boot off the WinXP CD. Tell her to watch the screen, it will prompt her to "press any key...."
Then just follow the instructions to delete the partition. Then have her create a new partition & format it as either FAT32 or NTFS, depending on your preference & size of the partition. Read these instructions, complete with screenshots:
2500+ Sempron @ 2100mhz
10.5 x 200mhz @ 1.80v