I'm sorta having the same problem - last night when I tried to start it on my laptop I got this:
oops - I guess the image won't post - it says "Improved Update Available" - I click it and it says it's loading, but it just stays there and doesn't do anything.
and it just stayed there. I switched to my PC version and it ran fine. I tried doing an uninstall/reinstall this morning, but the result was the same on my laptop. When I click on the Play link on the website, it looks like it's trying to run the mobile (m.wgt etc.) version. I'm not sure what else to try except cleaning up the registry from all mention of WGT golf and see if it can reinstall completely clean.