networking - Is my network card faulty?

The network connectivity in my main windows 7 desktop machine is unstable. When logging on it takes time to "warm up" and connect to the network and after that frequently times out or is unable to reach other parts of the network or internet. Other computers on the network do not have this problem.

So I'm trying to troubleshoot what is wrong with this PC. My immediate thought is that it's the network card. How can I determine that this is the case before I go out and buy a replacement? The current network card is built into the motherboard.

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