Ouch! Yeah you're stuck with it if you've never imaged your drive. You could try F8 on reboot and choose "Last known good configuration". If that fails then try safe mode. Otherwise that's it. OEM pre-installed OS are a pain and 99% of the time as you've now noticed you only get a CD image of your OS installation on disk, not the original OS installer. As Chris mentioned it is clearly (kind of) specified when you purchase the machine. Implicitly anyway. You'll know for next time.
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