Thanks. As to other progs, lots of 'em from Photoshop, Nero, Outlook etc etc etc. Avast says my computer is clean, as does the Spyware prog. Avast rotates when scanning and when it is doing that the turn off occurs. Why does that happen? If avast is not the guilty party what is? The fact that this happens when avast is scanning seems odd to me but I'm not a computer expert. Why does a manual start keep it on Ok and why has ths started happening? Is there some way i can look at what avast is "rejecting/ changing or whatever " when it scans to see if Adobe gamma loader is there and then turn that off? In short, where do I go now?