Do you see the images on your D70 ?
If you do, the problem is on your PC. You can verify this by going to a a place where you can print photos using Digital Medias (Rite Aid, CVS, Walmart, etc), and there's no charge unless you would only want to view your images. If you can view the images on those photo machines, then there is no problem with your D70 and no problem with your CF.
Not being able to view them on you PC may mean a lot of things. It can be your Memory Card Slot reader, it can be your graphics software, or it may even be a PC configuration or even an IRQ conflirt on hardware. Try downloading a graphics software that would be able to view the type of graphics file that you have set your D70 to save (i.e. JPG or NEF). If that still doesn't work, then try borrowing a CF memory card from a friend and see if it works on your PC. If doesn't then your Memory Card Slot reader is not working. You may wanna buy an external card reader (USB) which can accomodate a CF.
It will be helpful if you would post more detailed information based on the suggestions that have been posted here for you. It will be easier for us to diagnose the problem.