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This does sound like a software problem. Are you running a firewall, maybe? (Also, what version of Windows?) As you said, reinstalling Windows is an option. That often solves problems although, IMO, it's more often because you don't reinstall all the other software, or reinstall it in a different order, thus eliminating whatever's causing the problem (often without really discovering what it is-all you see is that reinstalling Windows fixed things).
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