TCP/IP Protocol driver not installed

Experts!  I have a client who's XP Home pc can't access the internet or obtain an IP Address.  I would really like to not have to rebuild this as they don't have the cd's it came with.  I tried replacing the NIC with no success.  I checked the event viewer and found numerous services that depend on the TCP/IP protocol failing.  I followed the MS document on repairing/reinstalling the protocol but it hasn't worked.  I also tried a couple of other suggestions all with the same results.  

I ran AVG FE 7.5 on the pc along with SuperAntiSpyware and found no infections.  The only thing odd being reported by AVG is that the shell32.dll was "changed".  Any ideas?
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samiam41Asked:
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Peter HartCommented:
IN THE CONTROL PANEL AND NETWORK CONNECTIONS (sorry caps off)  you can see the icon 'local area network' ?  if not you need to install the driverforthat ethernet connection.
if it is installed, right click on it and select properties andthen click on the TCP/IP settings and make sure they are set to automaitc - close all that ....
next press start - run and type in "CMD"
in the dos box type in "IPCONFIG" and see whatthe settings are;
if you can see the default gateaway make a norte if its address and then in the dos box tye pthe following
Ping <default gateway>

whant happens
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cbmmCommented:
copy the tcpip.sys from a good xp machine and paste is to c:\windows\sytem32\drivers. have tried resetting the winsocks http://www.softpedia.com/get/Tweak/Network-Tweak/WinSockFix.shtml
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Peter HartCommented:
try this winsockffix tool - it will attempt to repaisr the tcpip stack.

http://www.wedoc.com/software/WinsockXPFix.exe
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Peter HartCommented:
make sure all firewalls are switch off,
chekcthe cable since you said this is the second nic interface
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samiam41Author Commented:
Thanks for the posts.  I am getting ready to test them now.  While I was waiting for a reply, I thought I would be smart and boot off the cd, go into recovery console, rename the shell32.dll to a different name and copy the new shell32.dll over.  Man that was dumb.  Bluescreened like a mother!  So I will need to get back into recovery console and undo my screw-up.

I already tried the network testing (I'm a network engineer when I'm not working on clients' pc's) and I get the error stating the tcp/ip protocol stack is screwed (not installed on any network card).  

I did run the winsock fix with no success.  Let me copy the tcpip.sys over and I will update accordingly.

Thanks for the suggestions.
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samiam41Author Commented:
the firewall won't start since the tcp/ip protocol stack is unavailable.  : )
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samiam41Author Commented:
Can I extract the tcpip.sys from the xp cd?  
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samiam41Author Commented:
Just renamed the file so that it would start up again.

Do you know how mad I would be if it was the network cable?!?!  Luckily I used two (tested it by connecting it to my laptop) so they should work.  Physical layer first.  Good call though.
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samiam41Author Commented:
cbmm-  i copied that file from my laptop (xp pro) and restarted the xp home pc.  i didn't think about the different versions until just now.

chilternPC- i just downloaded that app and will copy to my thumb-drive to get it installed.  
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samiam41Author Commented:
FCK YES!!!  Replacing that tcpip.sys file fixed it!  Now I found out that the system is hammered with a Trojan virus.  

Trojan horse BHO.DAB in the c:\windows\system32\dimapi.dll and devmgro.dll files.  Looks like there is some more work to do.  Great job and thanks for the suggestions.  I am going to work on this Trojan.  Take care.

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samiam41Author Commented:
Awesome!
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cbmmCommented:
your best bet is to pull the drive and scan it with avg, or use
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samiam41Author Commented:
cbmm- use....??  : )

I posted a follow up question on how to remove that virus and i ended up using hijackthis to find the problem and then combofix to get rid of the bugs.  normally i would rebuild the computer after something like that but they don't have the recovery CD's and i would hate to charge them $$$ to reinstall windows.  Thanks again for your help!
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cbmmCommented:
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samiam41Author Commented:
Very good.  Gives me something else to look into.  Have you used this CD and the included tools?
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Windows XP

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