my advice would be installing on an external hdd first.
if you got an usb disk (or evan a 8gb usb memory stick should work) it is easy to install on that disk first, maybe on a 10gb partition. only prequesite is you bios allowing to boot from usb.
the advantage is:
1. no impact on running system - no danger of ruining windows install
2. avoiding "driver" problems with unsupported (ide) chipset (but usb might cause problems instead )
3. having a spare osx install for troubleshooting later, if you decide to intall native on pc.

go for it

---

Leopard 10.6.5 | Core i3 | Gigabyte H55M-USB3 | ATI 5770 | Coolermaster Cosmos