Hello, purchased new 64bit win 7 pc and usb keybaord however it doesnt work. it is showing as connected in BIOS however login screen unable to type. only the backspace, space amd H keys seem to do anything although not what they should be so unable to login. rebooted with an old ps2 keyboard which works fine but then fails after plugging in the usb keyboard once logged in. there is no specific driver for the keyboard as it uses the microsoft ones apparently, any ideas what I can check?