I have been using the lgnclw32.dll contextless login for quite some time and
it works great. I wanted to migrate away from this to the LDAP contextless
login. I deleted the registry keys for the old method (but didn't delete
the .dll). I configured the ldap settings and tried it without rebooting
and it works fine.

When I reboot the computer, I get a BSOD as follows:

STOP: c000021a {Fatal System Error}
The windows Logon Process system process terminated unexpectedly with a
status of 0xc0000005.
The system has been shut down.

What now?