Wanted to mention to users that if you are upgrading to version 4 and are running as a service but do not use the local system account then be aware that the foxweb data and logging folder has changed.
You will have to allow Read/Write access to the following folder.
Foxweb data location: "c:\Documents and Settings\All Users\Documents\FoxWeb\AppData"
I think that this may have been done as part of the Vista Compatability but am not sure.