TPM 1.2 security feature

[johnson636]

A friend of mine has a HP Compaq dc5700 Small Form Factor PC that he wanted me to install xp on. Well I ran into a problem and can't seem to get around it. I couldn't for the life of me get the **** thing to boot from the cd drive even after I set it to do so. I did some reading and found out why it wouldn't; TPM 1.2. Its security feature pretty much prevents users from booting from a cd without proper authorization. How can I get around this, if possible?