Hi thanks once again for the replies. At the minute I am doing the memory test, and the answer to the windows error message there does not seem to be one. It shuts down and asks to reboot in safe mode. I have had a smell of the power supply and that seems okay as it is not that old.After checking the memory I am going to give it another run with the same settings and see what happens. It seems always to be when i,m am landing on a ils, about 900ft from the runway.