Nice job, velocity37. I'm sure that helps some of us, but my case is different it seems. I did some further research that suggests that Adobe Drive CS4 which is automatically installed with Adobe Photoshop CS4 could be the culprit. Following directions I found on another forum, I was able to solve it:
Unregister the DLLs by running in cmd:
regsvr32 /u "%CommonProgramFiles%\Adobe\Adobe Drive CS4\ADFSMenu.dll
regsvr32 /u "%CommonProgramFiles%\Adobe\Adobe Drive CS4\AdobeDriveCS4_NP.dll
then do search for anything named Adobe Drive CS4 in regedit and delete them
then delete the C:\Program Files\Common Files\Adobe\Adobe Drive CS4 folder.
some of the items will be in use, but you will be able to at least delete the ADFSMenu.dll if you have all explorer windows closed!
the other dlls left in the folder dont seem to matter because now EAC runs like it should!
Oh and photoshop still seems to work