Win 7 and E3000 router

Question

I have just bought an E3000 router when my old router died last week.  I am having two problems:
1.  The data rate slows down after a period of time (long message trail elsewhere)
2.  I cannot see everything on the network.
I have several Win 7 computers, two win xp computers,  three NAS devices (linux based), and a printer sitting on the network, along with two switches to cope with all the traffic (not to mention iPods, iphones etc.)
With my old router, I couold see everything plugged into the network from my main Win 7 computer. (note:  the win 7 network map does not always work, but the windows explorer window of the network always showed everything).
With the E3000 router, I can only see 1 or 2 of the devices on the network.  If I reboot the router, then sometimes all of the devices appear on the windows explorer window (sometimes not)
I am running a workgroup (not a domain) and i am not using win 7's homegroup because that will not help with the non-win 7 devices.
Is there a setting that will help me to see all of the devices in Win 7 (either on the router or on the computers). I suspect it is a router issue as it worked with my old Zyxel router.
...steve

Answer 1

Dudztgp:
Sorry the colors of the link didn't show up well and I missed it.
My issue is that the computers cannot see each other in windows explorer.  Most are wired connections and if you go to windows explorer and look at network you only see yourself most of the time - not the other computers or the NASes.  This makes sharing files difficult when you cannot see them. 
I have central files sitting on the various NAS devices and i cannot see them in explorer. The Cisco Connect says everything is connected.
Everything that should have internet access does, the issue is this side of the router.  It is almost as if the message that a computer is on the network is not being sent to the other computers - like the router is blocking it.  As I said before, the old router did not have this issue.
thanks
...steve