Can't See Other Computer for File Sharing

Hi guys, thanks for all your reply, I finally solved it.
I'll describe my few latest attempts because I don't really know which one is the real solution lol, or maybe they all somehow connected.

I turn on my XP, follow the instruction from znod's link, specifically enter these commands on cmd :
netsh int ip reset resetlog.txt
netsh winsock reset
then I restart the computer.Still no go.

Next attempt, I remove the wireless adapter, switch the network with a wired connection (luckily I still have a LAN cable long enough for the distance between the computer & router), set up the connection (with static IP & DNS) and voila, my shared folder on 7 showed up on Network Places and I can access them. Then I unplug the cable, plug the wireless adapter, set up the connection again (again, with static IP & DNS). it's still there! And I can access shared folders on the XP from my 7 too.

When I check the ipconfig, it's a little strange because it's showing DHCP is disabled. DHCP is the protocol which enabling computer to connects to each other and to the Internet, right?

Code:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Tata>ipconfig /all

Windows IP Configuration

        Host Name . . . . . . . . . . . . : Tata-PC
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Unknown
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Wireless Network Connection 2:

        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : TP-LINK 300Mbps Wireless N Adapter
        Physical Address. . . . . . . . . : B0-48-7A-8B-A9-CA
        Dhcp Enabled. . . . . . . . . . . : No
        IP Address. . . . . . . . . . . . : 192.168.1.9
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.1.1
        DNS Servers . . . . . . . . . . . : 202.73.99.2
                                            61.247.0.4

C:\Documents and Settings\Tata>

I'll mark this thread as solved. Thanks guys for all your help,.

DHCP is the system that assigns IP addresses. Routers hjave a DHCP Server and computer have a DHCP Client that ask for an IP from the routers DHCP server. If you assign a static IP there is no need for the computer to have a DHCP client as it already has an IP address so that computer service is turned off on that network card.

OP, I am glad you have it sorted.