I have been using ED 4.12 for years and in the recent period have had issues with it on windows 7. Now every time I start it I get a message from windows:
Do you want the following program to make changes to this computer?
That dialog is referring to express.exe. I have a colleague who also uses 4.12 with windows 7, but he does not have this issue. It may be that he has UAC completely turned off, but I am not sure.
If a 5.x version of ED would solve this I'd upgrade, but I'm not sure that it would.
I have tried altering the windows 7 compatibility so that it's running for xp sp3, and tried with and without admin rights and it does not help.