Error message pops up on Windows 7 when playing .TS file

The following error message pop ups on my Windows 7 computer when I try to play a .TS file: The decompression codec cannot decompress to an RGB format. This is very unusual. Check that any "Force YUY2" options are not enabled in the codec's properties.
I have tried checking and un-checking the “Directly decode uncompressed YCbCr (YUY) sources” option under Options Preferences which never made any difference. I am also unable to load a .MTS file format as it is not listed in the file type. If I upload it by selecting “List all files”, I am receiving the below message: “The file "F:V-dubTest2.MTS" is of unknown or unsupported file type. ” I think both the errors are related.
Please help me resolve it.
Thank you.
