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I think there is a bug in the keyboard driver that misses key releases sometimes. When it happens to me, I generally find that hitting another key stops the repeating key. If you don't use auto-repeat very much or at all, you might try putting the delay and repeat rate all the way to the right in the keyboard control program.
As for the double-strike of the space bar, that definitely sounds like a hardware problem to me and I'd contact Dell support about an exchange.
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