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#21
Since this problem seem to have multiple solutions, I can only add what solved the problem for me.
Win7, so it seems, doesn't like certain drivers when it comes to network cards. It prefers its own. So if you've installed your network card and are experiencing internet drops/cuts when you are downloading or just browsing the webb, you should try uninstalling the driver and run with Win7's own driver.
Go to Manage > "Device Manager" and locate your network card and uninstall the driver, then reboot. This should (hopefully) solve the problem.