Here is their website...pretty sparse info...
This is from the page about bootlocker...
So, you need a boot disk...does the machine in question have a floppy drive? Can you get into the BIOS to set the machine to boot from something other than the hard drive?Need support? Contact Us with your support request. Please note that with the volume of email we receive, we cannot answer emails regarding lost passwords, or being locked out of your computer. There is no back door or easy hack around BootLocker. If you do get locked out, the best way to bypass it is to use an external boot device, such as a CD-ROM or floppy disk. Almost any competent computer technician can do this, with any security program - not just BootLocker.
If so, create a bootdisk or get one from bootdisk.com. If not, then you'll need a bootable CD...usually the OS install disk will work.
Then, you should be able to get in and uninstall the program.
And if you are on XP pro...change the permissions on you son's account to disallow installing software.
Also, have you tried hitting the capslock key before entering the password?