workk

I was on msn, and i was coping and pasting something and i pressed the wrong button and all of a sudden it disappeared! and when i went to click on the program it doesn't open! what have i done! and how do i fix it?? i pressed the space bar and another button... Please and Thank you

I was on msn, and i was coping and pasting something and i pressed the wrong button and all of a sudden it disappeared! and when i went to click on the program it doesn't open! what have i done! and how do i fix it?? i pressed the space bar and another button... Please and Thank you