i got it working!!! i ended up finding an email address for someone on the adobe updater team in one of the adobe forums and emailed them directly. here's what i got from them, and it worked for me (this is apparently specific to iis 7.5):
1. make sure the services for IIS ASP and ISAPI Extensions are installed.
2. go into 'handler mappings' and add a script map with the following:
- in the Request path, type: *.xml
- in the Executable, type: C:\Windows\System32\inetsrv\asp.dll
- give it a name (i called mine xml)
- for Request Restrictions, i locked mine down to a file, with just the verb GET, and 'script' access.
once you have that in place, the updater should work! good luck : )
wally