I would look into doing one of two things:
Use an A-D bridge, like the Canopus ADVC-110, or find a Sony Digital 8 camera (only has to work so far as to playback of the 8mm tapes), and use that to digitize the tapes.
For some more info on using an A-D bridge, connected to your computer via FireWire, see this article: http://forums.adobe.com/message/3751091#3751091
>There is no S wire and I do not have a firewire on this computer just USB 2 and 3 ports
You need Firewire... a card to plug into your motherboard will work... Use a TI chip for firewire http://forums.adobe.com/thread/940242
Then, a device from http://www.grassvalley.com/products/converters to convert the signal from analog to digital