Can't load any Network device drivers after infection

My client's machine had a virus infection that we have now cleared up. In the aftermath, we find that all the devices under "Network Adapters" are not loading. Each of them has a yellow exclamation with the error "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing (Code 39)".

I have tried reloading the Nvidia nForce drivers from the disk, no joy. I then installed a new Realtek Ethernet card, which XP always picks up on its own, but it gets the same result.

The devices seem to be properly identified and they even seem to be locating their drivers (I can see driver versions and file locations under Driver Details) but still no go.

Any ideas?
shamrinAsked:
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regnighcConnect With a Mentor Commented:
Run ComboFix
Will almost certainly repair any damage the virus has caused.

http://combofix.net/download
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shamrinAuthor Commented:
Thanks for the ComboFix reference. But I don't think the problem is an infection, that is fixed. The problem is that (probably) the infection managed to change something that prevents the network devices from loading.

In that regard, I note that the first thing that does not load is MRxSmb.sys. I've replaced that file and also checked the registry to make sure it is referring to the correct file. Still no joy.
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regnighcConnect With a Mentor Commented:
Get your OS disk ready and run this command

sfc /scannow
It might take a while, but shoudl replace any missing or damaged system files/drivers

Hope this helps
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