Hi, I am having trouble with a PC. He tried to install a new Gfx card and ram, all seemed to be going well until the software from the card was installed. Now, after boot I get the following error box; lsass.exe - System Error Indicates a revision number encountered or specified is not one known by the service. It may be a more recent revision than the service is aware of. When i click ok the PC restarts, I have tried safe mode and still the error persists. Any ideas?