webserver help?

i'm running [either] UniformServer or Virtrigo Server (latest of each). i can't access localhost. i get:

error '8002801c'

Error accessing the OLE registry.

/iisHelp/common/500-100.asp, line 17

i've tried outright disabling XP's and McAfee's firewalls, and have set both to allow both programs. i tried opening port 80. i'm making sure only one server is running at a time. nothing works. suggestions?