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For my version (counterstrike retail) it's HKEY_CURRENT_USER\Software\Valve\CounterStrike\Set tings\Key, for Half-Life itself it will probably be HKEY_CURRENT_USER\Software\Valve\Half-Life\Settings\Key. Try deleting that key and the game will probably ask to enter it again next time you run it.
Oh I almost forgot, to access this key, click on "Run..." in the start menu and enter regedit.exe and press enter, then just follow the key like described above.
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