It's a 2+ year old thread you're posting in, you know ....
Anyway:
1. Use Explorer to look at the contents of your unit. Create a folder called screen that goes in the root of the unit.
2. Within that folder, create (using Notepad) a file called capture with NO extension and NOTHING in the file. Make sure the file does not really get saved as capture.txt or it will not work. Control Panel-->Folder Options-->View-->Advanced, make sure 'hide extension for known file types is UNCHECKED.
3. When you want to do a screen dump, tap in the top left of your screen and you'll hear a shutter sound.
4. When you look at the contents of the folder screen using Explorer, you'll see a file or files with random numbers and a .jpg extension (or is it .bmp, I don't remember).
That's it.
If you've done the steps and it is not working, your issue is probably with step 2, the file not named properly.