Connect your desktop to your wireless network with this TP-LINK N900 TL-WDN4800 PCI Express adapter, which features 2.4GHz and 5.0GHz dual-band operation with data transfer speeds up to 450 Mbps. The CD utility helps you setup the installation software.
I set this up in fall 2016 in a Dell Vostro desktop running Windows 10 that had a flaky wireless NIC from another manufacturer but the wired ethernet connection worked fine. Powered it off, opened up the case, swapped cards, put it back together, started it up, inserted the driver disk, installed the driver and TP-Link utility (which is very nice, BTW), and was online in minutes talking with a Linksys E-series gigabit wireless router on the 5-GHz band. No complaints here. As always, make sure you mind static electricity when you install these. When you first pull it out of the protective bag, always have one hand on the computer case's bare metal and the FIRST thing you touch on the NIC should be the big metal end plate, NOT the circuit board or any of the components. Lick your fingers before you do any of this to enhance conductivity, and then any errant static electricity will be eliminated between you, the case, and the NIC, and you'll protect the circuitry.