I was under the impression that you could not re-install w7 that was pre-installed (on hd of an acer desktop) on hd using a new mobo. Well, while installing a heatsink i did not secure my cpu correctly and blew out my cpu and mobo. I decided to salvage the remaining parts ( hd, ram, graphics card , ect.) and start a new build. Anyway, after putting it together i booted the computer up with the hd from my acer desktop. After it attempted to repair itself , i selected the full recovery option. Now keeping in mind that this copy of w7 had been already installed on a different mobo, i did not expect this to work. But, work it did! This went against everything i had read. I do not know if the fact that the chipset were in the same class (1st installed on foxconn 780g then on an asus 785g ) had anything to do with it (my "youngster" status is well deserved) but i am not going to look at a gift horse in the mouth. The other part of this i wanted to mention was that on the perfomance index it showed that i now had 3 days to activate my copy of windows. When i entered the key that was on the side of the case it said it was not valid and gave me the option of buying a new one or attempting to activate it over the phone. So, i called the 800 # and (automated) and followed the prompts. On my screen i saw 9 sets of #'s and was prompted to read them out loud. after conferming these #'s, i was ask on how many computers had this copy of w7 been installed on. After that,i was given a new set of #'s to enter into corrosponding boxes. And wala! My w7 was fully activated. I know there was supposed to be a question in here somewere , but i thought that this was info that might help someone. Now for the ?. Everything is running well except for a couple oh hiccups. Does anyone have any suggestions on how i might be able to smooth things out. Any info will be appreciated.