How to setup Linksys WRT120N for a dialup connection?

Question

I have a Linksys WRT120N wireless router. There is NO broadband modem connected to it. There is only a dialup modem inside the desktop computer.
Windows XP SP3 is sensing that there is an always on connection to the internet with the Linksys WRT120N
Question: How to I configure the Linksys WRT120N for a dialup connection?
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Answer 1

Update
The DHCP Server "disabled" setting doesn't stick, it returns to "enable" when returning to the configuartion settings tab, for whatever reason.
Anyway, everything else seems to be there, including the "MSHOME" for networking; but STILL doesn't recognize dialup as default connection.
Here's an example of what I'm seeing:
When a time sync program is run automatically at startup, before the Linksys router was added, it would WAIT for dialup connection to be made BEFORE syncing the time. 
After Linksys router was added to the computer, the time sync program, when starting with windows, will NOT WAIT for a dialup connection to be made, it will attempt to sync with NO DIALUP CONNECTION being made.
A temporary fix has been to go to Local Area Connection (the Linksys router connection), right-click and uncheck Internet Protocol (which will also uncheck client for microsoft networks and file and printer sharing).
I've manually reset Linksys router back to factory defaults and waiting for any help.
The USB Adapter has not been configured to work with the computer that will be networked.  Currently, I plugged it into the computer with the Linksys router to quickly give you all the information I have for the ipconfig /all
(The networked computer will not always be used.  What prompted my post, is that first, what I am really after is trying to fix this problem with the time sync program seeing the internet connection as "on" when a dialup connection has not yet been made.  Then, I'll focus on the second computer networking.)
As you requested here's the ipconfig /all info:
Microsoft Windows XP [Version 5.1.2600]
Windows IP Configuration
        Host Name . . . . . . . . . . . . : XXXXXXX
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : Yes
        WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Wireless Network Connection:
        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : 802.11n USB Wireless LAN Card
        Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-XX
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.1.101
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.1
        DHCP Server . . . . . . . . . . . : 192.168.1.1
        DNS Servers . . . . . . . . . . . : 192.168.1.1
Ethernet adapter Local Area Connection:
        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
        Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-XX
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.1.100
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.1
        DHCP Server . . . . . . . . . . . : 192.168.1.1
        DNS Servers . . . . . . . . . . . : 192.168.1.1