Thanks.
Cable modem ---------> Wireless Router which uses wireless to connect to PC via USB wireless adapter. (Any other wireless devices?)
PC Built-in LAN ---------> CISCO E1000 Router --------> (x4) to other PC's.
The PC with Built-in LAN being the device that shares a printer, a NAS, or other resource. Correct?
Are the two "neworks" to be completely separate?
And there may be some additional details etc., to be taken into consideration. E.g., only one router can be assigning IP addresses. Probably the wireless router.
Fortunately there are other similar postings in this forum. Look for wireless access points, bridging (perhaps), subnetting, internet connection sharing....
Here is one such thread. There are others.
http://www.tomshardware.com/answers/id-2772093/wireless-adapters-connect-networks.html
Probably the overall consideration is the assignment of IP addresses via DHCP and the subnetting necessary to separate the USB LAN from the "CISCO" LAN.
Diagram the desired network and include the internal IP address assignements (DHCP, Static) along with the subnetting being used. Please include in the make and model of the wireless router.
That will provide a clearer understanding of your network and identify what changes are necessary to meet your network requirements.