Can't run the game

[FellowOwl]

Hiya!

As the topic states I cannot for the life of me get Penumbra to run. I'm not that savvy of a tech guy but I 've never really had a problem before this.
Ok, I installed the game fine and everything but when I click to run it pops up with the little "Got Game" window thingy, and then when I click play it seems like its going to run (starts to change the screen to black, etc.). However, a windows error box pops up saying it cannot launch the exe. and the only thing that seems wrong is the error signature?

My specs are: 2.8ghz HP with a gig of ram and a Radeon 9800 pro 256mb

Thanks!