I think we may be seeing mob mentality in motion at the moment! Fine, maybe you aren't comfortable or don't enjoy reading AT's posts, but in that case don't read them! And certainly don't abuse the poor guy, none of us come here for that. This is an off-topic forum with no rules on what to post. I'm sure he'd have an understanding word for anyone posting about life difficulties.
AT, I've been in your situation, and yes it sucks and makes things harder than they need to be. My advice is just stay positive and work through them. Change the things you can influence, and learn to live with the things you cannot. It leads to a much, much happier life.
Sometimes life seems unfair, but it's only when you start to see a series of otherwise trivial events as major inhibitors that they actually become so. Concentrate on the actual problem - in this case getting your dissertation done. You say you can transfer it to your PIII, do it now. Fixing your main PC will wait, your dissertation will not. If you spend the next 3 days fixing your PC it becomes a major inhibitor, not a minor irritation.
I have no idea if any of this will help, but I just wanted to try to give you the benefit of my personal experience with similar situations.