Are you running all those anti-virus programs at the same time? That could be a problem. Some AV programs will interfere with installations. You can turn off the AV programs by stopping and/or disabling the corresponding service. Services are found in the Administrative tools program group, or right-click on My Computer and select Manage, and browse down to the Services node.
If you turn off the AV software, even temporarily, don't go into email or browse the web, as you are at risk of infection. The best thing would be to pull out the phone/network cable during the time the AV services are stopped.
Try running the install again with the AV software turned off, and see what happens.
The other suggestions about FDISK and reinstall of XP are valid, but that may be beyond what you want to attempt at this time.
Thank you for your help. That turned out to be exactly what the problem was!