You can go USB or PCI but the best signal will generally be with a PCI card. Hopefully you're at SP3 on the device for security reasons. Proximity to the wireless router/AP and any obstructions could be an issue. The closer the better and with fewest walls, floors, and large metal objects would be best. Whatever device you choose, it will come with software as Windows will need drivers. I'll recommend that you find a way to load drivers only and not the other software that comes with these. Let Windows wireless zero handle the connection and make sure you're at least using WPA for security.