I have had this happen. There are a number of elements to check. First, check your BIOS setup, usually by pressing <Del> or <F2> during startup. (A notice on the bottom of your screen during bootup should tell you what key to press.) Does it have a setting for detecting USB components? If it has a setting similar to my computers, it is 'Legacy?' Set to 'enable.' Most keyboards I have are USB 1.1 devices.
Second, check your Settings>ControlPanel>System>Hardware>Device Manager. Look for the Keyboard listing and expand. Is there another keyboard listed? If so, Uninstall. Then click on 'Action' and 'Scan for hardware changes.' This should result in recognizing your keyboard, and allow normal startup.
Third, if this doesn't work, find the installation CD or download installations files and re-install your keyboard (as suggested by Ray).
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