I've just changed my asus m5a97 le r2.0 motherboard and amd fx 6300 CPU out for an msi z97 gaming 3 and Intel I5 4590. I was expecting to reinstall windows (I don't have a disc so I would have to buy it again) but decided to see if it could boot up anyway. For a while it wouldn't post and after some trial and error found that the graphics card was somehow causing it. It then managed to boot which I was happy with and then miraculously started loading windows! It had to do some repair thing and restart and then it seemed fine and still is. I was just wandering if I would need to reinstall windows after all or just leave it as it is?