Windows 7 machine can't connect to network

Have a windows 7 machine which can no longer get on the network. It gets a 169 if the adapter is set to auto. I usually set a static ip on the machine but that is no help either. I can't ping our server even after setting a static ip. I also tried to reset winsock but to no avail. I ran the troubleshooter, in windows 7 and it said something about dhcp service not working. Any suggestions on how to troubleshoot this?
clloccAsked:
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AllTripCommented:
Check on the back of the machine for the link lights on the NIC.  If there are no link lights, you are not getting any connectivity.  Also reseat the network cable from both the computer and the wall jack.  If you have access to another location in the building, try a different jack to see if you can connect.
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PaulD77Commented:
Did you check on the local machine that the NIC is still functioning correctly thru device manager, updating the driver?  if it is, did you try a ipconfig /release and renew and dnsflush?
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Kent WSr. Network / Systems AdminCommented:
Setting the IP manually would eradicate the DHCP error message.
I would plug the NIC into a know good, currently used, cable you know is on a good data / switch port, and see what happens.  As stated above, you should get good link lights, etc.
Trouble can be a few places, and it helps to narrow down.  Doing this, you can narrow it down by eliminating a bad ethernet cable, bad wiring from wall port to switch, bad switch port or patch cord.
Then you will at least know where the problem resides.  Machine...or links between machine and network?
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clloccAuthor Commented:
I tried reseating the cable but no luck.  I tried uninstalling and reinstalling drivers, no luck.  I tried updating the network drivers, no luck.  I tried release and renew but no luck. I tried installing a usb to ethernet adapter, no luck.  I tried changing the cable from the jack to the computer, no luck.

I feel like this could be the machine because....earlier this same machine had trojans on it and would no longer start windows normally.  I was able to boot into safe mode and delete the viruses and after that, windows started booting normally.  but not we have an issue with not connecting to the network, which makes me think that possibly some effects of the virus are still lurking somewhere.

I will see if I can get another machine working off the same cable and jack, which should effectively eliminate any network issues and isolate the machine as the source of the problem.
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AllTripCommented:
If the machine had a trojan it is very possible that a windows file was infected and got removed during the cleanup.  Either way, if it is an issue with the computer or with the network I would still reimage that machine to eliminate the possibitlity of an infected machine being on the network.
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clloccAuthor Commented:
the only issue is that this is our head accountants machine and he has sensitive data we need to save before the wipe. I was hoping that I could clear the viruses and get him up and running but now i'm beginning to contemplate your suggestion
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PaulD77Commented:
Did you check your services?  Check that Network connections, RPC, and the Workstation service is running
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AllTripCommented:
That would be an even more convincing reason to reimage that machine.  Accounting information is not something you want to have on an exposed machine.  From previous experience, the only true way to make sure a virus is gone is to wipe it clean and start fresh.  It will be more work upfront, but in the long run it will save you from having that type of data exposed to a potential reinfection.  

If you don't want to completely wipe the hard drive, you could always replace the hard drive and put the image on the new drive.  That way you still have the old drive intact in case any data was missed in the transition.
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Kent WSr. Network / Systems AdminCommented:
I would highly suspect the Trojan('s) that were found.  To save your data, you could boot with Ultimate Boot CD or similar (which puts you on a network connection) and save the data you need to a USB device or network share (after you've ran a scan with one or all of the included AV / Malware detection programs)
A little more dangerous, pull the HDD out, place in an external hdd enclosure, and attach to USB.  Watch out, though, as some AV/Malware will infect other volumes once attached to a device.

But, if you have to save the data, it may be worth it before doing the recommended OS reinstall. Make sure to scan all the backed up data files, also, and just trash any settings / app data. That's usually where this junk resides, if not in the system directories.
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sazukeCommented:
check the host file:

C:\Windows\System32\drivers\etc

open it with notepad and delete all the direction and save (you must have administrator permission to modify this file)

the open lmhosts.sam in the same directory and do the same
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netballiCommented:
Hello,

if you have a laptop you can connect the machine to the laptop with a cross cable setting the IP address manually and then you can run any file transfer between them. This will also confirm if the network card on the machine is working or not

The other option is, you can use a Usb HDD to copy all the required date off the machine

You can also check if the Scope defined on the DHCP has enough IP address left for this machine to get a spare one.
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clloccAuthor Commented:
i switched the cord from the patch panel port (leading to the jack with the pc experiencing network problems) to another switch and the machine gained network connectivity.  Thanks for the tip
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clloccAuthor Commented:
Thanks for all the advice from everyone, I greatly appreciate it!
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