In the link:
http://technet2.microsoft.com/Office....mspx?mfr=true
you can read that A2007 doesn't support the creation of an .mde file:
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MDE file limitations
MDE files are MDB files with VBA source code compiled into computer code and VBA source code removed. Office Access 2007 cannot convert or enable an MDE file. To upgrade an MDE file, you must find the original MDB file and convert that file.
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You'll have to switch to A2003 or "lower" to be able to do this :-(
Nic;o)