Hi Bojan,
First of all, log into your router and check that it can see the USB drive. Also check the USB settings seem OK.
You are correct with how your router is setup with the IP address. The fact that you can log into your router proves that.
In one of the above replies there was a mention about "your router shoulnt be using the *.1.1 address" THIS IS NOT CORRECT, so ignore that comment. Each router can be setup differently to the other.
So if your Win7 PC just worked normally when you first plugged it into the router then all good as the router would have automatically assigned an IP address via DHCP.
Looking at the manual from your link, you need to setup a username and password for the USB drive which you indicate that you have already done. Can you put in some new details in case you have forgotten the current ones. Unless you are absolutely sure you remember them.
This is different to the username and password that you log into your router.
The manual then states to type in the IP address for your router using Microsoft Explorer, (not Internet explorer), (only the IP address, no drive names), and then if you put in the username and password you setup in the USB drive settings, then you should have access. The router seems to detect which access you need via the username and password. ie: Router settings vs External USB settings.
From the manual:
====================
Accessing USB hard drive Connected to NB604N using a Windows PC
Now exit out from the NetComm router’s WEB Interface page and open up the “Windows Explorer” and
type \\192.168.1.1 on the top address bar.
Note: Windows Explorer is different from the Internet Explorer. You can open a Windows Explorer by
opening Computer or Documents.
=================================== ============
Use \\192.168.1.1 Don't use
http://192.168.1.1
Then see how you go.
Also can you plug the USB drive directly into your computer as a test that it just works?
The other thing also could be what was mentioned in a previous reply which is the firewall settings.
Let me know how you go and what steps you take.
Cheers,
Damien.