I don't think it would be digital downloads but it could be you don't have enough RAM memory running it's happened to me before and I need more RAM and a new grpahics card but before you go out and buy this stuff, (because it's expensive) check your RAM rate and if you have a graphics card. It would be useful to know if you have a laptop or a desktop computer and how old/new your PC is.
I have a laptop and i've had it for a year and 2 months now
Make sure you have nothing running in the background and no peripherals, liked a phone or MP3 player, plugged in to your system. Windows will stop pr5ocessing the top program to check on the peripherals every minute or two - it is really annoying.
