BSOD after Enabling LMCompatibilityLevel value in Registry

andysickler · 06 Apr 2011

Hey, sure hope one of you can help me. I'm running Windows 7 Home Premium 64bit, OEM, on a Dell Studio XPS 8100.

I was recently trying to enable file sharing between this computer and a Mac Pro on our network. One solution I tried was to edit the local security policy to allow NTLM communication by adding LmCompatibilityLevel to my registry. However, upon rebooting, I got the irql_not_less_or_equal blue screen. Now it only boots successfully in safe mode w/o networking.

I've tried deleting the value. I've tried restoring to a previous configuration. Neither work. Any ideas?

andysickler · 06 Apr 2011

For anyone else who might have this problem, I was finally able to resolve the issue by uninstalling the network drivers (Device manager, network adapters, right click and uninstall each one that doesn't look generic. Write the names down first so you can find them to reinstall.) I was then able to reboot normally (without the BSOD) and reinstall the drivers.