In Console in 7.5 a window is not loaded when clicking on the raise user hyperlink used to create a new user. This window is usually displayed if you select the hyperlink while the field does not have a user selected.
The issue can be worked around by clearing the editor type on the User object in Object Designer. Then recycling the application pool in Configuration Centre to apply the setting. Please do not do this while the system is live. This will then load the window correctly.
Please also make sure that the properties of the label on the window has the sub-type set to the correct User type so that the correct window can be launched. This should be checked in Window Manager.
If you have this problem please raise the issue with your support provider quoting problem reference number 5439.