[PNP drivers not being detected after install although they are being copied??]

In my task sequence I used "Apply Driver Package" to install the drivers, but when I log in, none of the drivers are installed. The drivers are however being copied across to the PC, and when I do a local search the driver is picked up and installed. Shouldn't these drivers be automatically picked up (and installed)? What am I doing wrong?

[Deploying WinXP using SCCM incorporating MDT2010]

I need to setup a new imaging process using SCCM and Unfortunately we still use XP (Won't be migrating to Win7 anytime soon either) - I need to setup a process to image new "bare metal" PCs using ZTI and PXE boot. Has anyone done this before? The only guides I can find online are for Win7/Vista or refer to migrating to Win7. Any help would be grately received!