The command prompt does not work with prevention enabled on Windows Embedded POSReady 2009 which has been updated with Windows updates.
Add a memory exception for the command prompt. Edit the prevention policy and go to Sandboxes > Default Windows Programs and Services. Under Memory Controls > Exceptions for unusual memory permission changes, add an exception for C:\Windows\System32\cmd.exe.
Affected agent operating systems: Windows Embedded POSReady 2009