PC World has Angry Birds for free if you download Intel AppUp and register. It says 10,000 are available (Intel AppUp @ DSG - includes Dixons)
How to play Angry Birds on PC incase you don't know!
Press and hold the bird by left click of your mouse. You can also zoom out and zoom in while playing the game by touchpad or scroll button on your mouse. It will be better to play Angry Birds by mouse so you can directly zoom out and zoom in into the game. In initial version of game it looks weird but as you keep playing the game you will like it. Angry Birds shows real estate graphics on your large screen, which makes every level easy to play where Angry Birds for smartphones graphics were too small. To view the entire field of the game, zoom in and out to take a look on smartphone but on desktop you don't need to zoom a lot until there is any hard level to play.