Thanks for the suggestion BLOWERS, but no... I had no additional programs open (just the usual stuff in the notification area of the taskbar that runs in the background ie antivirus etc and nothing there has ever affected OrangeCD. So I don't think that should be a problem, version 6.1.8 works fine with all the same programs running.

I've tried installing 6.1.9 several times, tried removing OCD and then installing the new build, but the same problem everytime. I've never had any problems installing any of the previous versions. There is definitely something in the new build that is affecting my PC.

Any other suggestions?

Cheers

David