My computer is a year old desk top running windows 8.1. A few weeks ago I was typing a message and just as I was hitting enter a dialogue box flashed on the screen but before I realized it and read it I had already selected something and my keyboard promptly stopped working. Pressing the keys caused it to beep but not type. on restart it worked for my login but beeped after that. device manager said it was functioning properly so I looked in ease of access and toggled off sticky and filter keys, uninstalled and reinstalled the keyboard, tried another keyboard , bought a new one, used system restore and now half of the keys work- I made sure it was set to US English and still only half the keys work. some keys bring up right click menu. I've also tried holding down the shift keys. any suggestions?
Does it work with another computer? do you have access to a linux bootable live disc? they work wonders to troubleshoot hardware related issues (if it works on other OS on the same machine then it's a software issue, if it doesn't then it's a hardware issue). I need more information about the state of the supposedly faulty keyboard.
Also, chances are that you got some annoying malware there, run a check using
adwcleaner it's freeware and portable.