When I open iPhoto, the screen splits and has lines on it. Has it got a virus?

I have had problems with my Macbook Pro recently. There has been several occassions where the screen looks like it is split in half and has fuzzy lines all over it, and I am unable to move the mouse or control anything. The only way I can get rid of it is to restart the Mac completely. This has never happened before and the Mac is only two years old. I have worked out that it may be due to iPhoto, as it seems to happen not long after I open the application. Could it be a virus? Or is it anything else?

I have researched this lots but can't seem to find an answer.

Any help would be greatly appreciated.... I need my Mac so much, like we all do haha!