Is there a way to test my program on other platforms without installing a VM?

I am writing a python program and I want to test it on other platforms - windows 7, 8, XP, vista and also 32 bit and 64 bit. Is there a way to do that without installing a VM for each platform?

VM installation takes a lot of time and space and it just seems like an overkill for simply testing a program.

Thanks!