Illustrator :: Screen Freezes And Fails To Update While Dragging?

Just started a pen tool exercise in illustrator, at some point while using the pen tool I don't know why or how it happens but my screen stops "updating", "refreshing" or "drawing" while I drag it with the hand tool. What I mean is that if I start dragging with the hand, the rulers move as normal, but anything inside just stays a still picture and only when I release the mouse button is the screen changed to where I have dragged. Although the very edges of the artboard/workspace near the rulers behave normaly, I can see bits and pieces flying past there, but it's like there's this big square at the center of my screen that is a still image.
 
The problem is only inside Illustrator, the rest of my computer and screen behave normally.
 
I am using Windows XP SP 3, all updates 'n' stuff.