PC wont boot always Blue Screen

My computer will not boot always goes to blue screen with the message STOP: c000021a {Fatal Sytem Error} The Session Manager failed to create protected prefixes system process terminated unexpectdly with a status of 0xc000003a (0x00000000 0x00000000). The system has been shut down Please Help!

What is your OS (Operating System)? Can you boot into safe mode (by tapping F8 at boot)?

DannyBoy, read here, see if this MS article can help: http://support.microsoft.com/default.aspx?…kb;en-us;156669