No Dialog

I am seriously fed up with the "Logon Process has failed to create the security options dialog" error box. It has been a repeated problem that I can only overcome by removing the Vista Service Pack 1. Every so often Windows automatically installs the Service Pack, I experience the crashes, then I reset to an earlier restore point. While that has worked, it isn't particularly satisfactory. Unfortunately it looks as though the new version of Everquest II won't run without the Service Pack, something about a resource issue. So once again I am battling with a computer that keeps crashing. Using my work laptop to search the Internet this doesn't seem an unusual problem, but there doesn't seem a reliable fix. I am hoping on it being Windows Defender. I have turned off Windows Defender in the program settings but that wasn't enough. I then had to go into the config program to discover that although Defender was turned off it was still loading (gee thanks Microsoft for that amazing piece of logic). Anyway now that is unchecked as well and we will see what tomorrow brings.