Sending but not receiving packets - hardwired

My laptop's connection to my router was working but stopped working a week ago. Packets are sent but not received. Is this a configuration issue or a virus issue? Running Windows 2k

P.S. On a perhaps related issue my wireless connection stopped working a few days before my hardwired connection, giving me a Code 10 error. That's why I went hardwired to try to search for a problem to the wireless connection. After being hardwired for about 2 days, that conked out too.

Things I've tried:
-Use Opera browser instead of IE - no change
-Access the router from another laptop - works fine
-Try a new ethernet cable - no change
-Run ccounter, spybot, AVG - no change

Note: I could not run panda or bitdefender because I do not have an internet connection. I am using my local library's computer to research and download possible repairs.

 

Further to the original post, I've run (in safe mode) ccleaner, GetRunKey, ShowNew, SpyBot, AVG, and HijackThis (under the name analyse.exe).

 

And still no luck getting my ethernet connection working. Am I barking up the wrong tree?

 

Someone suggested I check my network connection in case the problem is not malware. Bear with me if it seems like I barely know what I'm doing. Here's what I did:

-Pinged 127.0.0.1 - worked fine
-Checked the autoconfiguration IP for my NIC (it was a number starting with 169.*.*.*), then pinged it - worked fine
-Verified that my computer is set up to get an IP automatically - it is
-My computer was not given an IP by the router.
-Tried to ping the SMC Barricade router (192.168.123.254) - failed
-Rebooted and reset the router by holding the reset button 5 seconds - no help
-Uninstalled and reinstalled my Intel PRO/100VE NIC - no help
-Tried a different Ethernet cable that I know works - no help
-Verified that my computer's Ethernet connection shows a green light to indicate a good ethernet connection - yes it does
-In the Device anager I checked my NIC properties and it says it's working ok

Someone suggested I may be missing a system file critical to networking but I don't know how to diagnose that or pinpoint the name of the missing file.

HELP!!! I'M AT MY WIT'S END!!

 

Not getting an IP leased from DHCP server

As indicated below, I've checked some configuration details and checked for malware. Althought the DHCP server is leasing IPs to other machines both wireless and hardwired, it's not leasing an IP to me, hardwired.

-already checked the cable by testing with another machine
-already checked the NIC (I think) by pinging itself
-since the router works for others, I assume it's not the router
-made sure the machine's set to get an IP automatically (in fact I changed it to static IP, tried entering a static IP as indicated in my router manual (which didn't work) then reverted to Auto IP which didn't work.

What can I now check in W2K? HELP!!

 

OK Goto
start>settings>network and dialup connections
Right click on the LAN
Choose properties
Click on Client for Microsft Networks
Choose properties
Note down the RPC service shown
click on cancel
Click on Internet protocol TCP/IP
Choose properties
Note IP address and DNS settings, should be auto
Click on ADVANCED
On the IP settings Tab
Note IP addresses and Gateway address, if any, should be blank
On DNS tab all entry fields should be blank
Append primary and parent should be ticked
On the options TAB
Note the properties of all entries in the list
In particular TCP/ip filtering should be set to permit all


Post those parameter that I have asked you to note and we will take it from there.

Final thought. How did you connect wirelessly? Is the hardware still connected and are its drivers still installed, if so remove and uninstall. You were right to go for the ethernet. Get that working first, then reintroduce the wireless bit.

Studio T