playback malfuntioning

I fairly new to this, and would appreciate some help. I am having trouble with my playback. The input and output divers/devices are set the same; so it should not be a problem with that. But a newly recorded file plays back at double speed intermittantly and with lots of crackle and pop. It actually seems to have recorded that way, because the waves look weird as well. So it may not even be a playback problem. I have no idea what is going on. (I also uninstalled and reinstalled all my drivers to see if that would make any difference, which it did not.) All/any suggestions would be greatly appreciated.