Glad to hear that the fan idea worked but not so glad to hear about your problems re-appearing.

I would try and get my hands on an old pc to run it off rather than a laptop, heard about one or two people that have had problems using them and then other people having no issues at all, just pot luck into which category you fall.

If you lived a bit closer you could and come and 'borrowed' one of mine as I have a stack of half decent PC's in the corner of the workshop that would do a better job of running mach3 than your laptop.