Computer freezes while installing

[peterjun]

I looked at the compatibility documents and couldn't find anything that isn't uncompatible with my system:

AMD Opteron 175 Duo Core (socket 939)
Windows xp sp2
Trying to install Protools 6.7 LE (I have the first Mbox)

When I install it goes to 100% however after that I get the windows xp popup saying something like "windows doesn't approve etc..." and I can either click on continue anyway or stop installation. Right after I click on continue my computer just freezes. I can't do control alt delete or anything.

After I restart I get the pro tools softwware icons and everything but it says error loading program and I can't uninstall so I ran the protools uninstall program. I keep on trying to install but it freezes at the same time all the time (right after the windows popup).