Yah I get that too. I tried both a fresh and upgrade. and no matter what it wont work...luckily I tried it on my test board before doing the one for my site.
I'm running IIS 5 and ActivePerl on Windows 2000 SP2.
My website is on a Unix server and my friend upgraded his (we're on the same server) without any probs. I'm kinda reluctant to upgrade after all the hacks I've installed...