your old pc may be overheating due to build up of dust and fluff inside. It would probably be useful to open it up and have a good clean out. I would be very careful about transferring too much from the old to the new. I would simply copy over my stuff from my documents. Install all your old progs, that you want, on the new pc using your original disks. This will keep out a lot of the old crud that will have built up over the years on the old pc.