Restored a registry backup. Everything works now.
StealMySoda, on Dec 14 2009, 12:51, said:
To be honest I think it's the fact that you messed something up in Explorer, not the fact you tried to use 'last known good config' that caused your computer to crash.
You can delete explorer.exe and your system will still boot. Sorry but anything relating to explorer.exe will only effect your GUI / Usability - your system will still be bootable.
The LsaLookupOpenPolicy call failed with the following error:
This is the culprit. Whatever it is.