Nothing silly about what I said.
I’ve encountered the same problems as the original poster, on my machines and on other people’s machines.
In all cases, it came down to hardware problems or dirty keyboard, or driver problems.
The OS was NEVER the problem. Not that it couldn’t happen, but, not that I’ve encountered or heard or read about, other than the member above.
Yes, it was silly, because he specifically stated the problem only started when he upgraded his OS. When a user can pinpoint exactly when the problem started like that, you can safely eliminate going down false roads such as the ones you suggested. I highly doubt that he spilled a can of pop on his keyboard WHILE he was upgrading to Windows 8.
Now, you say the OS was never a problem for you, but that just tells me that you probably haven’t had very much experience upgrading OSs, if you have never encountered an incompatible driver issue cropping up immediately after upgrade. If you had, you would probably recognize the symptoms he is describing fit that scenario to a T.