start->run
type dxdiag and press enter
display tab
click disable next to DirectDraw

video play back will be slow without it on but you can at least grab a screenshot.

[Link]

If you are using Windows Media Player 9, pause the video at the scene you wish to capture.
Press Ctrl+i (that's control key plus letter 'i'). Think of the 'i' as "image."
The "Save Captured Image" dialogue will open up. Choose the folder you wish to save the image in -- choose the file type (either JPG or BMP) and give it a file name (default name is "capture.") Click on "Save."
If you plan on doing any further manipulation of the saved image it's best to save it as a BMP to retain the original quality. You can use Paint (or other app) to save it as a JPG later (Preview pics for PureTnA should always be JPG).

You can't take a screenshot if the program is using overlays to display the picture.
In windows media player you can disable overlays and screenshots will work, I recommend you re-enable them afterwards.
Tools>Options>Performance Tab>Advanced -- uncheck "use overlays" if it is checked. If that doesn't work, turn video acceleration all the way down.

Windows Media Player 10

Guess what? It's exactly the same procedure as WMP 9.

Media Player Classic

This is NOT a Microsoft product -- it's open-source (free) and works very well even though it looks like the old MS Windows Media Player 6.4. It's easy enough for beginners yet has options and features for the more advanced user. Get MPC from: http://sourceforge.net/projects/guliverkli/
On that page you will find it under the "Latest File Releases" with a "Download" link.
1. When you load the video in MPC pause it and go to [File], [Save Thumbnails].
2. A dialog should popup In the dropdown box where it says file name, choose whatever you want or use the default name
3. Set the file type to .jpg - .bmp images will not upload here
4. For the thumbnails options select however many rows and colums you want for the screenshots. The product of the columns and rows will tell you how many screenshots will be taken i.e. 4 rows x 4 columns = 16 screenshots
5. For image width, though the PreUpload page states 800 px should be the maximum width but you can go as high as 1024 px without causing too much trouble for users here
6. Referring to 4 and 5 - you should bear in mind the wider the image you make and (to a lesser extent) the more rows/colums you make, the larger the file size will be and remember you can't adjust quality. It's best to do no more than 8 rows by 8 columns for 800 px wide pictures and 6 rows by 6 columns for 1024 px wide pictures to keep under 256 KB if you plan on using PureTnA's imagehost . If you plan to use a different imagehost such as imagefap.com or jpghosting.com or hidebehind.com you can make the image wider and have more rows and columns.
7. Click [Save]
8. Depending on the length of the clip and your processor speed, it will take between a few seconds and 5 minutes to scan the video and produce the screenshots
NOTE 1 - you can't manually pick the frames you want, the only option is to adjust the number of rows OR columns to alter the number of images it shows and as a result your shots will differ
NOTE 2 - you get the "GetCurrentImage hr=8000ffff" error, you need to change the Playback Output. Go to [View], [Options], [Playback], [Output]. If the file type is .avi, .mpg or .wmv change the DirectShow Video button to "VMR7 (windowed)" or "VMR9 (windowed)". If the file type is .rm or .mov use the "DirectX 9" option. Now click [Apply] and screenshots now work.

[Link]