Users can experience an Access Denied error if they have written a customization using the Financial Edge API
Full error message is below "Access to Blackbaud Student Information System / Financial Edge install directory and subdirectories has been denied. The Microsoft Jet database engine cannot open the file 'C:\Program Files\Blackbaud\The Financial Edge\SYSDB\afnsys7.mdb. It is already opened exclusively by another user, or you need permission to view its data."
Turn OFF User Account Control(UAC) on the computers that are receiving this error.