Leadoperator is correct

Format the card and it should be ok. If it continues, try a better card like a kingston or PNY. Those are definitely 100% compatible with the cam. If that still doesnt work, try to reset the cam as follows. With card in cam and remote plugged in, turn on the cam. You will hear 3 beeps. While it is still on, open the battery door until the light of the remote goes out. Count to 10 and close the battery door. You will hear the 3 beeps again. Go thru your menu settings to make sure everything is still the way you set it. If your interval between videos is less than 10 seconds, then also try upping it to atleast 15 seconds or more.
Let us know how that works out.
Joe
BBO
PS. It may be a PC issue as well. Let the video run completely on your pc, then run it again to see if plays well afterwards.