Not enough information to give any meaningful suggestions. Please, state the following:
OS name and version - In the mean time, I can offer some generic suggestions.
If your LAN connection is built into the motherboard and was working before, chances are the drivers weren't installed properly when you re-installed the OS. It could also be an issue with your Comcast application - Assuming you are using WIN XP, RIGHT click on My Computer, then <PROPERTIES> then, <HARDWARE>, then <DEVICE MANAGER> - if you see any Yellow Warning Marks next to your LAN adapter it's likely the drivers that are not installed. That would be easy to check. If you don't have any Yellow warning marks then, all your hardware is ok and the problem is caused by something else.
Make sure also that you are allowing your Comcast app to automatically set internet connection, instead on Windows.
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Ok - go to My Computer, then
Scroll through all the devices listed in that window. Do you see ANY *Yellow* Exclamation/Question marks?
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