Mousehook.dll is a library associated with Stephen Lebans hack for locking
the mousewheel in Access so that it doesn't scroll thru records. The download
and some info on it are located at:
http://www.lebans.com/mousewheelonoff.htm
Are you getting a message that it can't be found? If memory serves, on some
systems you have to make sure that Mousehook.dll is in the same folder as
the database resides in. If this database came from another source and was
installed on your computer, the DLL file may not have come along for the ride!
You can use the link above to download the sample database. When you do,
Mousehook.dll will be there as well.