I've got two computers in a LAN behind a wireless router.

One has XP with ip 192.168.1.2

This one has W7 with ip 192.168.1.7

If I try to ping the other one from this computer, I get this:

C:\Users\Srekel>ping 192.168.1.2

Pinging 192.168.1.2 with 32 bytes of data:
Reply from 192.168.1.7: Destination host unreachable.
Reply from 192.168.1.7: Destination host unreachable.
Reply from 192.168.1.7: Destination host unreachable.
Reply from 192.168.1.7: Destination host unreachable.

Ping statistics for 192.168.1.2:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Tracert gives the same result:

C:\Users\Srekel>tracert 192.168.1.2

Tracing route to 192.168.1.2 over a maximum of 30 hops

  1  Kakburken4 [192.168.1.7]  reports: Destination host unreachable.

Trace complete.

Although I can ping and tracert the router without any problems. I have disabled the firewalls on both computers. The router is set to use DHCP (if that matters).

Here is the output from "route".

C:\Users\Srekel>route print
===========================================================================
Interface List
 13...00 25 86 df c6 89 ......TP-LINK Wireless N Adapter
 12...e0 cb 4e 26 b9 84 ......Realtek PCIe GBE Family Controller #2
 11...e0 cb 4e 26 be 94 ......Realtek PCIe GBE Family Controller
  1...........................Software Loopback Interface 1
 16...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2
 14...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0      192.168.1.1      192.168.1.7     20
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      192.168.1.0    255.255.255.0         On-link       192.168.1.7    276
      192.168.1.7  255.255.255.255         On-link       192.168.1.7    276
    192.168.1.255  255.255.255.255         On-link       192.168.1.7    276
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link       192.168.1.7    276
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link       192.168.1.7    276
===========================================================================
Persistent Routes:
  None

IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
 14     58 ::/0                     On-link
  1    306 ::1/128                  On-link
 14     58 2001::/32                On-link
 14    306 2001:0:5ef5:73ba:881:20c1:3f57:fef8/128
                                    On-link
 14    306 fe80::/64                On-link
 14    306 fe80::881:20c1:3f57:fef8/128
                                    On-link
  1    306 ff00::/8                 On-link
 14    306 ff00::/8                 On-link
===========================================================================
Persistent Routes:
  None

I've set up and debugged a few networks in my life but I'm not really an advanced network user, so I'm not sure what might be wrong. Any ideas? Oh, and pinging this computer from the other computer doesn't work either.

EDIT: Adding arp output:

C:\Users\Srekel>arp -a

Interface: 192.168.1.7 --- 0xd
  Internet Address      Physical Address      Type
  192.168.1.1           00-1f-33-ef-28-01     dynamic
  192.168.1.255         ff-ff-ff-ff-ff-ff     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.252           01-00-5e-00-00-fc     static
  239.255.255.250       01-00-5e-7f-ff-fa     static
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

Adding ipconfig...

C:\Users\Srekel>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : Kakburken4
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : TP-LINK Wireless N Adapter
   Physical Address. . . . . . . . . : 00-25-86-DF-C6-89
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.1.7(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : 09 April 2010 23:09:45
   Lease Expires . . . . . . . . . . : 10 April 2010 23:09:45
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : 192.168.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller #2
   Physical Address. . . . . . . . . : E0-CB-4E-26-B9-84
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : E0-CB-4E-26-BE-94
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{74D5C406-894E-4000-8DE7-6AAEBF7C8382}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:73ba:881:20c1:3f57:fef8(Preferred)
   Link-local IPv6 Address . . . . . : fe80::881:20c1:3f57:fef8%14(Preferred)
   Default Gateway . . . . . . . . . : ::
   NetBIOS over Tcpip. . . . . . . . : Disabled