Booting XP from a secondary drive

Recently the motherboard on my pC failed so I bought a new pc tower unit.. reconditioned with a clean version of XP.

I took the old hard drive out of the dead pc and installed it as a secondary hard drive in the new box (E.. It works absolutely fine as a data store and even some of the software installed on it runs.

Not surprised to say MS Office does not run from E: but not a great problem as I have an installation disk with activation key and its now installed on C:.

The only problem is that on the version on the old PC I had a legal working copy of MS publisher (I bought the old machine second hand with software installed). But Publisher is not on my installation disk and I don't have an activation key.

I think it should be pssible to boot the old installation of XP from the E: drive and run it from there. But here's the propblem.. I can't get the HP boot setup utility to recognize that the E; drive is there as an option to boot from.. It can see it as a second IDE hard drive... but not in the menu where you'd expect to set the boot device priorities..

Any advice appreciated