So I guess it's time to bite the bullet and get this computer fixed. I honestly thought I'd managed to do it myself with a rebuild but it seems there is just something fundamentally wrong with my videocard. I can't avoid it any longer.
I lost around two hours writing tonight and that was really the final straw. I shall continue to edit what I have and should have a new chapter of PP up tomorrow but I'm going to have to fix this once and for all.
It is one of the worst feelings in the world to have your computer freeze, leaving you staring at a screen unable to hit just one more key that would have seen the last two hours of work saved. I'm not going to say which story I was working on as that will only make a certain group all the more despondent.
On a more positive note, I have my library in order finally - my books are all out of their boxes and on the shelves. Once I have a few more things in place (like an actual desk) I'll have my wonderful writing environment back, which will please my muse to no end.