Under settings -> About Phone -> Build Number and/or Mod Version, what does it say? Some ROMs aren't listed there, but most are. Alternatively, you can download the paid version of ROM Manager (unless it's not already there), and find out what it lists as Current ROM. Good luck, some ROMs have this bug, but it should be easy to fix.
Power off the phone (or pull the battery) and hold the x key and power it back on. You will either be in SPRecovery or Clockwork. You'll want to wipe data at minimum. Let us know what recovery you're in and we can go from there.
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