I would point you to jing as a very simple, easy, and free to use screen capture program. It does both pictures and video capture.
http://www.techsmith.com/jing/
Also Windows Vista and 7 have a built in capture program called the "snipping tool."
Windows 7 x64, Precision T3400, Intel C2Q @ 3 GHz
8 GB RAM, ATi Radeon HD 3870 |