Well I reinstalled after following gizzmoe's advice, but forgot to patch it to 1.4. Anyway it started and I began playing the Barham mission was well in to it when I got the message and it went back to desktop. I think i will have se my friend about this one.
Thanks for all the help guys.

Well guys I thought I had it beat, played from 8.33 pm till 9.11 pm when the system abruptly rebooted itself in the acadamy tutorial.

Got it fixed, my son in law sownloaded the latest drivers, more than an hours play and no crash's, thanks to you guys for all the advice and help.