We haven't yet tested the exclusion of the application and/or driver from the DEP restrictions (long story but the short form is that the IT is often unresponsive!) IT tells me that only EXE files can be put into the exception list for DEP. Is this your understanding as well? All of the Amyuni functionality is in .DLL files. Perhaps there is no point in testing if the Amyuni driver can't be excluded.