Getting an Isolated Storage Exception
This happens because there is a limit on the number of characters that make up the folder/filename of the isolated storage location.
It usually surfaces on Windows XP as XP uses a longer name for the root location.
It get worst if the user has been deleted then reinstated, as XP appends new folder info instead of reusing the old user locations.
As far as we have been able to determine, there is no work around to this, other than build a whole new XP environment and create the user again from scratch so that you minimise the root level foldernames.