I ripped some DVD's to my hard drive with Vista... does that help your situation? I ripped Superman Returns, Fantastic4, Cars and some others... Enjoy.. slysoft.com is your friend. ;)
Careful. Some around here might start calling you a criminal for doing that.
Interesting. Which flavor of Vista are you running? Did you pay retail for it. With 4 Win boxes it would become an expensive OS upgrade for me. In addition I just ran the MS Vista upgrade advisor. On only one machine, it flagged more than ten programs that would need patches or upgrades. The CAD and video editors become expensive upgrades on their own.
For the cost of just the Vista uprades, 4@$299, that $1200 almost buys a new iMac.