Probably. Can you still get into the BIOS? If so, just look around in there and try to find a "Reset" or "Return to Default" or something.
If you can't get into BIOS, you have two other options. There may be a jumper on your motherboard that you can use to reset everything. If you cannot locate that, then your other option is to remove the battery from your motherboard. To do this, power down your computer, unplug everything, take out the battery, wait 5 minutes or so and then put the battery back in and hook it all back up.
Just Google "How to Reset BIOS" for more detailed instructions.