Please Help!

Boss purchased new computer pre-loaded with Vista Home Basic. Trying to dual-boot with old XP Home drive from their old computer. Keep running into problems.

Going to try an "over-install" trying to repair windows xp with the new drivers and such for the new hardware. Would love to plug and play the drive but I hear Vista doesn't like to play nice.

Can anyone please give me some hints? The Vista drive is a serial drive and the xp drive is an ide drive. Computer recognizes XP drive as Ch 0 and Vista drive as Ch 2.

Edit:

I am first trying the repair method. It is recognizing the "old" version of windows on c: unless the "old" version is actually vista version which would suck because I've already factory restored once after doing all updates and deleting all factory crap (vista)

Edit:

That didn't work. Got 100% done and it said it couldn't do it. grrr