OK. I called the school and they do want the computers, but the neighbors who gave them to me asked me to delete all of the data first. The IT person at the school said they might use them for parts or to experiment with installing a different OS, like Linux.
So, I would like suggestions for a utility, probably run from a USB drive, that will completely wipe the hard drive.
Okay I'm not quite sure what you want, so here's a selection. If you want to erase all files but leave XP intact:
Delete Doctor 1.1 (from majorgeeks.com)
Eraser (from spychecker.com)
Free File Shredder 4.1.2 (from kakasoft.com)
If you want to nuke everything:
Active@Kill Disk Hard Drive Eraser (from killdisk.com)
CBL Data Shredder
Disk Wipe 1.7 or HDShredder 4.0.0 (both from majorgeeks)\
Lastly, BCWipe (from jetico.com) Don't recall which category its in.