My Friend has a Computer with Windows 7, Recently one of his friends was Installing Windows 8 on his computer (through a bootable pendrive) but he had to go so he took his pen drive during installation. And then there was a Blue Screen and then Windows 7 booted up as usual. But now it started crashing every now and then. But the problem occurred yesterday when I was surfing Internet on his computer and the computer crashed. When it booted up, LAN driver wasn't working. I went to Device Manager, and under network components, there was a Realtek PCIe GBE Family Controller and there was a yellow triangle and a " ! " on it. What Should I Do ?? ( Should I Install windows 8 Completely ? )
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