Well, they say some things are just meant to be...
Some quick recap (if you have the patience to read me, otherwise jump to the capital letters): I have these two computers, an old(er) HP Pavillion 1612n and the new one that I built with this Asus M4a78 plus. The new processor I bought (AMD 5600+) I installed in the HP which is my primary computer (simply because I can't find the time or patience to migrate everything). I use the AMD 4200+ that was on that HP in my new build.
When I could not install Win7x64 on the new one I started swapping parts between them (including the HDD on which I installed Win7x64 on the old one and tried to install and " repair" on the new). I swapped basically everything, EXCEPT THE PROCESSOR.
This morning I decided to do it. Many thermal paste stains later I had the 5600+ on the new computer. I started the Vista -> Windows 7 upgrade that had stopped in the middle and.... it went all the way! IT WAS THE PROCESSOR! I have no idea how that can happen, since the 4200+ is 64 compatible (and runs Vistax64 without any problem) and passed all compatibility tests. It never presented any problem. I don't think I was stupid (maybe a little lazy) for not having swapped processors, but could one expect that? Comments are much welcome (no reinforcement of the
"stupid" option if possible, please
I will now start bugging AMD to see if they can explain and if there is any solution. Being that this CPU is a good 4 years old, I think I am SOL and will have to dust my wallet off and buy a new one, ... but I need to know....
If anybody has advice whether I should just replace the CPU or wait for Microsoft to issue some SP that could solve my problem, please. Having said it, it doesn't sound feasibile, does it?
Also, should I mark this thread as solved? It is not really a solution, at least not an elegant one... I do hope it helps ppl not to spend so much time on the wrong things
But I learned a lot and I met some very interesting people here. I intend to continue contributing and learning on this thread. As I said, some things are meant to be. I do beleive in my signature (not only a MP fan)
Thanks everybody that tried to help.