From this link we read:
# Log in to Windows as the user whose shell you want to change.
# Start the Windows Registry Editor by entering regedit at a command prompt.
# Locate the following subkey:
# Select Edit --> New --> String Value and give the new value the name Shell
# With the new value selected, select Edit --> Modify.
# Set the value data to the path of the new shell— for example
C:\Program Files\VMware\VMware VDM\client\bin\wswc.exe
Note: No quotations.
# Click OK, and then exit Registry Editor, log out of the user’s account, and log back in.
# Apply it to a group of computers via a GPO to their computer account.
# Turn on auto logon using this article from Microsoft KB.