If the 'Flash Cards' don't appear at the top of the screen when you hit the 'Fn' key, then click the 'Start' button and type the word flash in the search field. In the programs that appear at the top, you should see 'Restart Flash Cards' and 'Settings for Flash Cards'. First, click on 'Restart Flash Cards', then again click on 'Start' and type in the word flash in the search field. This time click on 'Settings for Flash Cards', and make sure there is NOT a check mark on 'Disable all function keys', click 'Apply' and 'OK'. Then try the Function key/Flash cards + your F8 key again.
If the above doesn't work download the appropriate file to your desktop, and double click to install it, and reboot. You do not mention if you are still running Win7 32bit, or if you have changed to Win7 64bit edition, so only download the appropriate file.