I was using Vista Pro too - with Amiga 600...It was so incredible moment in my life - i was so excited to see rivers flowing my mountains (thin blue lines in very low resolution 320x256 px). It was a time when every picture was calculated in 4-5 hours, time to time 8-9 hours...Rendering was possible with :
-) Real 3D
-) Imagine 2.0
-) Turbo Silver
-) Sculpt 3D
-) first Cinema 4D versions
And these pieces of software were able to run with 2 MB of memory and 14 Mhz processor (Amiga 1200 had really nice Motoral 68020 unit inside)