Sure you can convert Mac to vista. Mac is actually using intel processor as siemens6688 mentioned.

You can go to the following link, step by step guide you how to convert mac os to vista.

http://www.mobiletechreview.com/editorials/Vista-on-Mac.htm

CAUTION: Once you converted from MAC OS to vista with clean format/install. You are unable to recover back to your MAC OS. So be consider.

It is better to create another partition for vista. Good Luck