How do I solve an unidentified network issue? It can't connect to the Internet

I fixed the problem (Realtek 8139 card) by disabling Bonjour. I would have to disable/enable the network connection after every boot until I stumbled upon this solution. Disable Bonjour; it is included with quite a few programs such as Itunes and Gizmo Phone. Type "services.msc" in a command prompt, find Bonjour in the list, and set it to disabled.

"Try this before messing with any drivers,

Run command prompt as administrator. Type the following: route print

If you see something similar to the following:

Network Destination - Netmask - Gateway - Interface - Metric

0.0.0.0 - 0.0.0.0 - On-link - [Your Network IP Address] - [A number (mine was 20)]

0.0.0.0 - 0.0.0.0 - [Your Network Gateway] - [Your Network IP Address] - [A number (also 20)]

Run this command:

route DELETE 0.0.0.0 MASK 0.0.0.0 0.0.0.0 if [Your interface number, found in the interface list under 'route print' (mine was 11)]

-

That should resolve any networking issues. Specifying routes can be very handy, but sometimes Windows screws it up like what was seen above."
"Try this before messing with any drivers,

Run command prompt as administrator. Type the following: route print

If you see something similar to the following:

Network Destination - Netmask - Gateway - Interface - Metric

0.0.0.0 - 0.0.0.0 - On-link - [Your Network IP Address] - [A number (mine was 20)]

0.0.0.0 - 0.0.0.0 - [Your Network Gateway] - [Your Network IP Address] - [A number (also 20)]

Run this command:

route DELETE 0.0.0.0 MASK 0.0.0.0 0.0.0.0 if [Your interface number, found in the interface list under 'route print' (mine was 11)]

-

That should resolve any networking issues. Specifying routes can be very handy, but sometimes Windows screws it up like what was seen above."

"I figured this out by talking to a friend at the local computer store. It's very simple to fix.

Enter Device Manager and locate your Ethernet or wireless card
Update the driver with a Windows Vista Driver - do not use the Windows 7 driver
Reboot and enjoy"

"From Networking home computers running different versions of Windows:

If you're using another firewall, you must open these ports yourself so that your computer can find other computers and devices that have files or printers that you want to share."