I have this keyboard: http://www.sunbeamtech.com/PRODUCT11.html
Sometimes I will be doing something and some keys will become unresponsive. As in I press the key but it does not function. Most commonly its the g and h key that stops working. However I am fairly sure it is not the keyboard because sometimes I can unplug the keyboard from my tower and replug it in and the keys will start working immediately. Sometimes not. I tried downloading and installing the latest driver off their site and it just overrides the current one. I did it many times so the driver is there. Any ideas?