problem with videos saving/recording in slow motion

When i record a video on facebook (on someone's wall) or certain internet karaoke sites, the finished product comes out as if it's in slow motion. this is the first time it's ever done this. I have been recording vids on those sites since i got this computer.

also, if i open up quick time and record a new video, it won't record. I'm using my internal cam/isight...if this makes sense.