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If I were you, I'd dual boot a Linux distro or Windows XP SP3 on that laptop so I could still run non-Vista compatible software.
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What's your computer's specs? What plug-ins are you using? Have you ever gotten this emulator to work on this laptop before? Anything you can think of may be helpful. Now if you're still having problems after trying all that, post again and give more information. You may or may not have better luck with one of these. Here are three other common Dreamcast emulators that play some commercial games. Try all these things first and if all else fails try a different emulator. Try another game or two and see if they work.
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