Need to know how to download HD video to the PC

[benshei]

I have a new Canon HF20 video camera, if I play my videos to HD TV through the HDMI cable, it looks great on the TV.
When I download the videos, using the provided Canon software to the PC, it creates .mts files, when I try to play these files on the PC, it looks very bad…. What am I doing wrong?

I am in a process to buy a new computer, it will be soon.

Thanks in advance, Eitan

[UncasMS]

closed for crossposting this issue more than once