Hello, On and off I've been having a problem with my keyboard where it will sometimes decide not to work. My friend suggested that I check to see if the USB port was the problem behind it. So, I went into the Device Manager to take a peek for a faulty USB port, but instead discovered that the "Plug and Play BIOS Extension" had a yellow exclamation mark on it. When I had a look at the device status on it, it said: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)". I have no idea what to do about this. I'm not a techie person, so I'm really lost. On a side note, this problem has also occurred with my mouse. And for the previous times that I had to deal with this problem, I just simply plugged the keyboard/mouse into another USB port and it worked fine after that. However, I just want to get this problem resolved, it's starting to worry me. I would greatly appreciate any help given.