Poker Night at the Inventory Graphics Issue

[MXSP]

Just bought the Telltale pack off steam and when I try and play Poker Night at the Inventory it looks like this.
http://img209.imageshack.us/img209/589/pni.png
My specs are as follows;
4GB DDR3 RAM
512mb ATI Graphics Crad
2.4ghz Intel processor

Any ideas what this is? My pc can run other games fine.
I tried changing the graphics but it didn't help at all.:mad:

[MXSP]

Anyone?

[DjNDB]

Are your drivers up to date?

Please also post a dxdiag log.

dxdiag
Windows XP: Go to your start menu and click on run. Type in "dxdiag" and hit enter
Windows Vista / 7: Press the windows key on your keyboard or click on the start menu. Type in "dxdiag" and hit enter.

Now click on the button that says "save all information".
It will prompt you to save a file. Save it where you can find it.

Then zip the file (http://www.howtozip.com/indexsubmenu.asp?submenu=windows_-_compressed_folder_1) and attach it to a reply in this Thread.