Just bought game for PC - can't play

I have a pretty decen gaming computer and have never ever had any problems playing any games. Windows 7 Ultimate 64 bit operating system. I just bought and downloaded this game yesterday directly from Telltale. This is what happens

1) It says: Loading............

then

2) The Wlking Dad screen comes up. At the bottom of the screen it says "click to continue"

3) I then "click to continue" and my screen goes wacko. It has the fluttering motion with a line of blur towards the bottom of the screen about an inch or two high. And it just stays that way.....with the screen fluttering like a strobe light.

Any suggestions?
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