can't ping my ip address

[ddpd]

I have a Sony VAIO, model VGN-S260, connected wirelessly (Wireless-G Broadband Router, Model WRT54G) to a cable modem. There are two other computers connected to the modem, both of which are running without problems. I am running Windows XP Home Edition.

Last night, my brother changed my network settings using the Network Setup Wizard, and I realized that I could no longer connect to the internet. I performed a System Restore to an earlier point to try to undo the changes, but that didn't make a difference.

I also ran the Network Diagnostics scan and found that there was a failure under my Network Adapters, specifically a failed attempt to ping the IP address for the wireless connection. The scan record looks like this:

[00000003] Intel(R) PRO/Wireless 2200BG Network Connection (FAILED)
IPAddress = 192.168.1.102 (FAILED)
Pinging 192.168.1.102 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.1.102:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)

Everything else on the list checks out. I have tried releasing and renewing the IP address. I ran the VAIO Recovery Wizard to reinstall the drivers. I have been pretty clueless throughout the whole process, so I really appreciate any help anyone can give me.

[G_Dem]

Try typing ipconfig /all

what does it say?

[degsy]

Are you using a Static or Dynamic IP?

Check the other PCs in the house for the settings.
If the router/modem is using DHCP then you should set your network to automatically assign an IP address.

[GMac222]

Yeah, I agree with Degsy just a couple of other things though check that you can ping 127.0.0.1 (this is a standard IP address that is reserved for your network card) if you get a result then your network card is fine and it is definantely a setup problem, if not then uninstal the card and reinstall it again.
Also check your workgroup or domain has not changed. This is less likely but may make a difference if you are using static IP. (Right Click My Computer - Properties - Computer Name - Change).
IF you CAN ping 127.0.0.1 then make sure your IP setup is the same as the other computers, i.e right click MY Network Places - Properties right click your LAN icon - properties and double click on your TCP/IP icon. This needs to be set either as dynamically assigned or hold a static address, just make it the same as the other computers.
Incidentally in this area you need to be showing what's called CAPS - Client (Most likely Client for Microsoft Networks), Adapter (your network card), Protocal (TCP/IP) and Services (minimum of file and printer sharing) any less and you may have problems. Choose install to add these.

[G_Dem]

Shouldn't the IP addy start with 192.168.1.x GMac?
I would do ipconfig /all and double check the IP address assigned to the card.

[ddpd]

I am able to ping 127.0.0.1 without problems. I also checked and confirmed that under Internet Protocol (TCP/IP) Properties the box for "Obtain an IP address automatically" is checked, on both computers.

In the area where you say I should be showing CAPS, these are the items I have: Client for Microsoft Networks, File and Printer Sharing for Microsoft Networks, QoS Packet Scheduler, and Internet Protocol (TCP/IP). The adapter is listed above under "Connect using:", but should it be listed below as well?

[GMac222]

Shouldn't the IP addy start with 192.168.1.x GMac?
I would do ipconfig /all and double check the IP address assigned to the card.
That is the network address (Class C) with 192.168.1.1 usually being the private IP address for the default gateway on the router. The router then uses NAT to pass your connection onto the next router using your public IP address as your identification.
127.0.0.1 is a test address reserved for the network card. If you can ping this then the card is working. The next step is to ping your default gateway, so like G_Dem has said type ipconfig (ipconfig /all) from a comand prompt and ping the default gateway.
It's all a matter of fault finding but you may just find it easier to reinstall your network card and setup again.

[GMac222]

Just another thought, try pinging one of of the other computer names to just to discount DNS.