Microsoft try hard to be like Apple but are failing at the most basic level, i.e., providing a stable OS for the apps one can depend on.
LOLOLOLOLOLOLOLOLOLOLOLOLOLOLOLOL....... Oh my... I can't stop laughing...
Apparently you haven't been paying attention to the iOS 7 rollout.
Or maybe you were being sarcastic?
In any event, I gave 3 possible places to look. Fine, the hard disk isn't at fault, but you should seriously consider checking the BIOS and your drivers.
If you understand how software works, you would understand that software doesn't just magically work on one system but not another. If the fault were in the OS, then it would fail for everyone (well, there are some exceptions to that, dealing with specific processor and motherboard architectures). The one thing that's different between computers is drivers, and the BIOS. So whenever a problem like this comes up, and it only affects a small number of people, it's almost always related to a driver and/or bios issue. Especially given the fact that it was a clean install.
Another thought.. are either you or john overclocking? I notice both of you have systems that are designed for overclocking... Please don't say "Yes, i'm overclocking but it worked fine before..." because a new version of an OS will use the CPU and memory differently, and what may have worked before might not. If you are overclocking, try going back to standard speed and see if that solves the problem. Overclocking also refers to running Memory or GPU at higher rates as well, not just the CPU.