Hey jbudd,
Not really sure, about what is going on there, maybe its the pathing, might want to try it in just C:\wamp
I did how ever install WAMP 1.6.6 from [
www.wampserver.com] this site here and I used the stable version of Joomla [
www.joomla.org] here.
Everything worked great and i was up in joomla in around 5 minutes.
Now i need to learn how to get around in Joomla
hope this helps some.