Anyone have a solution for frequent internet drops?

My PC is an amateur homebuild. Runs nice, other than it crashes if run longer than 2 hours and it has an irritating habit of randomly gunning down my internet connection (hard line AND wireless). I've tested the cable and the connection to my building's internet; they're fine. My Xbox doesn't run... show more My PC is an amateur homebuild. Runs nice, other than it crashes if run longer than 2 hours and it has an irritating habit of randomly gunning down my internet connection (hard line AND wireless). I've tested the cable and the connection to my building's internet; they're fine. My Xbox doesn't run into this problem AT ALL on the same line, same cable, same connection. My computer does. I've figured it down to being a computer problem: now I need to know exactly what is wrong with my buggy little pile of frustration that causes it to forget about the network cable stuck in its back. I am at my wit's end; the connection may be maintained for 5 minutes, 2 minutes, or the whole 2 hours. It's gotten much worse recently, and I've had enough. Suggestions or ideas?
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