Did you look at the link I posted about "repair installs"? You'd have to be the judge if it's simple or not.
Yeah, to me it is a big job and possibly bigger than what I can handle.

Since I did get yet another BSOD this morning, that is the thing now. Visit to the shop tomorrow morning!
Windows will be upgraded. Motherboard will obviously be new. Memory will be upgraded so they will be new.
Let's hope it will solve the issue.

Will keep you posted either way, later in the week, when I get it back (after a few days out of town).