Atomic that solution wont work for many. As there is not many BIOS's that i have seen that does floppy emulation.
The answer is to use Slipstreaming. Only sure fire way to get the drivers added. Use Autostreamer. EricB gives instructions in this thread:
How to keep WinXP really fast & stable
It is a few posts down. But he gives all the answers on where to go for drivers and how to do this. Easiest way than trying to mess with BIOS emulation that is not guaranteed to work.