You didn't say for sure if it doesn't work or if maybe you just forgot how to use it. In case it is the latter, here are the instructions:
1. Regular Keyboard. To capture just the window you have open, click "Alt" and "Prt Scrn" buttons together. (Use "Prt Scrn" alone if you want to capture the entire screen instead of just the active window.
**note** if you are using a notebook or laptop, you have to hold the "Fn" button down as well as the other one or two buttons mentioned above.
2. Click the "Start" Orb (bottom left of your entire screen on "Vista"
3. Type in "Paint"
4. Hit "enter".. this will open "Paint"
5. In "Paint", click "Edit", then click "Paste" There, your captured screen is now in paint ready for editing.
6. Click the "select" button (rectangular button) near top left of your paint program and use your cursor to draw a box around the portion of your picture you want to save.
7. Click "edit" again, then click "crop".
8. Now you have a picture of exactly what you needed.
9. Now click "File", then click "save" or "save as" and save this "picture" anywhere you can remember to find it later.