Can't run arduino exe

I'm completely new to arduino (and programming stuff in general) and just got an Uno to use for a project I'm working on. I downloaded the environment, and ran into an error message when I tried to run the program. I re-installed it and it worked, however it went back to same same problem when I tried to open it just now. Any suggestions? Thanks

Here's a screnshot

I think that's a Java problem - try intalling Java from the Sun website. Guessing you're a Windows user.

Yes Windows 7.

I just updated java but still get the same message..