How do I play .mov files?

Probably just tick it ( in your options ) What player are you using?

I am using Windows Media Player 10

Did you go to your Options > File Types & tick Movie?

it don't have .mov in there but I did select all

Have a look at 'VLC Player'. It plays pretty much every movie file out there.

I think you need apple quicktime. Before posting try google. Backup. Use anti virus software.