My vocals come in prematurely when recorded over a song

[fryeguy2]

When I record through my microphone over a song and play the recorded song back, my vocals are a fraction of a second ahead of where they were sung when I recorded them. My microphone is just a standard one from radio shack, not specifically for a computer. Obviously there is no problem with it sending the vocals to the computer, but could it be the reason for the timing being off?

Thanks for the help