yep. in that case, here's what to do:
1. download trial for/buy an app called candybar
2. replace default HD icon using that to whatever you want for the windows partition
3. reboot
4. ctrl-click the icon which you want to use for the mac partition
5. select get info
6. do the same with the icon file
7. click on the small version of the icon in the top part of the get info window
8. there should now be a blue glowing outline around the small version of the icon
9. copy
10. select small version of current mac partition
11. paste
12. reboot
13. you're done