Question : Problem: Network adapters missing ?

We have an e-machine w3080 .  Recently we noticed it was running a bit sluggish so we decided to format it.  Everything went smoothly until it came time to update windows.  We needed an internet connection .  Now normally I am able to plug the ethernet cord in and instantly we have a connection .  But today as our bad luck would have it.. For some reason the e-machine is not recognizing our network adapter.  How do I know this?  I went into the device manager and where there is usually a network adapter listed there is nothing.  It doesn't even say Network adapter its completely missing.

I've tried rebooting our computer and short of formating it AGAIN I am at a loss as what to do .  

Any suggestions?

I am almost positive the network card is still good.

Is there anything that can be done?

Answer : Problem: Network adapters missing ?

Does it show in device manager? if so, dow it have any error?
Have you installed chipset driver for the motherboard?