Thanks Heather:
It seems 7 out of the 9 machines in the office are displaying this problem. This has started some time in the last two months. I guess I've only noticed now since my laptop has just gone in for repair.
I suspect that it may be a windows update issue. The only common thread I can find is that the two machines that are working never had a particular .net 2.0 security update installed. Though this was an old update, I know that any .net updates on my laptop thoroughly and completely bust D-Tools.
Anyway, I've installed all the current updates on the working machines one at a time, they're still working. I've uninstalled all the windows updates from the last few months then reinstalled D-Tools, still not working.
I guess at this point it's up to the tech support crew.
Oh, and by the way, disabling the Anti-virus software didn't help either.
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