Currently Being ModeratedDec 7, 2012 7:13 AM (in response to Allan Eckert)
It sounds more like the CF cards have gone bad than anything. To determine this, try accessing them from another computer. If you have the same issues, then they've gone bad. Time to replace them.
Currently Being ModeratedDec 7, 2012 1:01 PM (in response to Frohmaster)
You didn't say, so I'll ask...
Do you format the CF cards in your camera(s)?
Also you stated "while deleting the files from my card". How are you doing this? Recommended practice for deleting files from a card is to format the card in the camera. If you haven't done so, give it a try and see what happens.