I succeeded in installing dual boot on a number of HP, Dell and Toshiba machines. You'll just need to work a bit and I'm sure you'll succeed. It's worth the effort to avoid this Vista crap.

You can find the xp drivers on the sites of device manufacturers. For example, for your 945G Intel chipset : Intel® 945 Express Chipset Family - Intel® 945 Chipset family information and downloads. You'll find the storage manager driver for your sata disk and a great deal of detailed information. Especially, how to implement your storage manager driver at xp installation time (the F6 routine).

The first thing I would do is run Everest (version 4.20.1170 or higher runs on XP and Vista) to find out what specific devices are installed on your pc. Then, go to the respective maufacturer sites to download the drivers you need.