Common consumer (HP, Acer, ...) problem. It is "unsafe" to always run in administrator mode so consumer laptops boot into limited user mode, but safe mode boots to true administrator account which is not your account. 802.11n did not exist as an actual standard at that time so at best its a "proposed" 802.11n and not even that because 802.11b/g means old 2.4 Gigahertz only wifi. Some network adapters, and wifi seems worst, write a Windows Native mode stub for each new version but use a user mode windows 95 program to do all the wifi processing. Win2000 dropped win95 support. WinXP brought back win95 support. Vista again dropped win95 support, Win7 added it back. Upgrading to Win8/8.1/10 again removes Win95 support. Since your fastest wifi is slower than USB 2.1 an external USB dongle should work fine. Internal wifi is either in motherboard or an M.2 card or mini pci card which is as easy to switch as upgrading laptop Ram. Rem turn off internal in BIOS if using external. Problem: Broadcom, like video company Nvidia, make chips and devices. Their drivers are for their devices, that work with the PCI identification VEN_ and DEV_ numbers from the device. Card makers that buy the chips use different ID for their Card/devices, causing driver problems. Motherboard makers same issue. I used to reverse engineer drivers but its not time smart.