avrdude: verification error; content mismatch

Okay, So the Atmea8 took the first sketch with out needing to burn the bootloader. Kinda weird because it was the RTTTL sketch from the tones library, and it played twice as slow, which suggested to me it was using the internal clock. At any rate, I tried to burn another sketch, and got the same result, had to burn the bootloader before I could upload a new sketch. I was looking through what the fuses do, and thought about the setting that keeps whats on there after each erase cycle, but I wouldn't even know what fuses are set on these things. How do you get to the command line to use the avrdude in xp?