Writing over all my code!

I'm using MCVS 2010 Express, toodling along writing my Plinko program, when all of a sudden I accidentally hit some stupid combination of buttons or keys, and all of a sudden all of my code writes itself over what I've already written, which is a bit scary because I'm debugging and it's destroying what I've added! I'm so confused, please help!
Do you mean when you type it is overwriting what's there instead of putting the new letters in the middle?
Try pressing the "Insert" key on your keyboard one time. (Should be near Home, Page Up, Page Down on a standard keyboard)
Ah! Shift+Insert worked. Thank you! I'm a bubble-brain.
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