I can't think why you are not getting any error messages unless you have turned them off.
Do you have a 'split' database with front end and backend with lots of data on a server? That slows things down.
I was going to suggest decompiling then recompiling but it's a bit worrying that even after converting to Access 2003 you still have a problem. But it's still worth a try; BACKUP FIRST
then click Start > Run and type in the box
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"C:\Program Files\Microsoft Office\Office10\MSACCESS.EXE" "Path and name of database including .mdb" /decompile
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You may have to vary the path depending upon where your MSACCESS.exe is.
Then open a module in VB and run Compile, Close the modle then run Compact and Repair and then try converting to mde.
If that fails, can you create a small new database with say just one table/Form in it, and see if that will convert to mde.?
Report what happens then we will all have more info.
S7