In Windows NT4/2000/2003/XP, the registry contains the information necessary to change the shell application from PROGMAN.EXE to VAPRGMAN.EXE. If you need to modify these settings manually, you will need to run REGEDT32.EXE. USE CAUTION: This is a database containing very important information about how your Windows NT4/2000/2003/XP system operates, modifying the wrong parameter could lead to nasty results. If you go to the key,
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
you will see the EXE name of the shell. This will be either PROGMAN.EXE, EXPLORER.EXE, or VAPRGMAN.EXE.