I've managed to figure out a way that you CAN use your blue wishblade with Windows Vista or Windows 7 machines (both 32 and 64 bit OS). And, you can do it without purchasing additional software. To start with, all you need is the original software your blue WB came with (wishblade advanced and the Wishblade controller) and the tutorial I have linked to below. The only other thing you need is a little patience, some computer knowledge, and a "restore point" set on your machine (just in case something goes awry)!
I've tried to make the tut fairly detailed, with screen-shots to help you along the way.
Click on the green button to download the tutorial!