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You CAN still replace the NIC (network card) in a laptop...forget about the internal NIC, and just get a USB wireless card...that's your easiest and cheapest option. Other than that, MOST laptops do not have a Wireless NIC integrated into the motherboard. One of the removable panels on the bottom of the laptop should cover a small card, roughly 1.5-2 inches long, 1-1.5 inches wide, with one side inserted into a "slot," and the other side hooked to 2 wires. It may/will have an intel or other logo on it, depending on the brand of wireless adapter. It should be attached using 1-3 screws, and is easily replaced. Shouldn't be tough, but a USB adapter is still easier.
As for the network "crashing," after a few minutes, I understand it won't connect to webpages...does it still "say," it is connected? Either way, if it is working for a minute, then stopping, and you have good signal strength, and no obstructions, then I retract my previous statement about the OS having little to do with it.
Anymore information you give cannot do anything but help us help you. The more information I have, the more accurate my picture of the situation is, and the better I can troubleshoot.
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