At my work we use a nice and tiny program called: Gadwin. With this program you can make screenshots and select a location where the shot will be saved (without pasting it into paint or something and then save it). Wonderfull sollution for the people that are having trouble with making screenshots with a Nvidia video card and the latest driver.
And it's freeware!
More info:
http://www.gadwin.com/printscreen/
Download:
http://www.gadwin.com/download/ps_setup.exe
Good luck!
^efil4kSiLiSaB
PS: you do have to change some settings to let it work properly (select location, file type bmp/jpg/gif/etc)