Generally Windows Movie Maker suorppt .asf, .avi, .m1v, .mp2, .mp2v, .mpe, .mpeg, .mpg, .mpv2, .wm, .wmv. If you use Vista it also suorppt .dvr-ms.Try convert your record file again and reset the productivity.Try another record converter.U can google or yahoo.Hope this can help you!