Why did I wake up to a blank screen this morning? Last nights update? [closed]

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http://askubuntu.com – Newbie to Ubuntu.Took me ages setting up a Geforce 6200 on a Dell Dimension 4550 with Ubuntu 12.4. 32bit Finally got it working,so much tinkering and tweaking went on,I've forgotten what I did :) Anyway after a few months with no issues.Last nights update before bed threw it off again,it would seem. Had to reinstall Ubuntu 12.4 from CD today.The Screen is back but sluggish and video is unwatchable. After the clean stand-alone install,when I try searching for the "Additional Drivers" it does not respond but gives an error message from "jockey-gtk" With the error message : The problem cannot be (HowTos)