You know I've been thinking that all day, ever since I saw an earlier post this morning... I'll bet it's Interlok (the antipiracy software) which contains within it's code the power to arbitrarily reboot your machine if it thinks your trying to to circumvent it. (throw "tpkd.sys" or "tpkd.vxd" into google and see for yourself) Some bloke using some music software had many of the same problems. Now that would be ironic... Perhaps the program as written by CL funtions perfectly, but the anti-piracy stuff is what's killing everyone's machine :P CL people: Just out of interest, what happens if I should install, say Adobe's Ebook reader software, (which also comes with Interlok) will that hose the protection, os it Interlok smart enough to realise the drivers are newer? (assuming they are newer of course) later jb