Check for driver updates for the card in the tower. You may need to go to the Buffalo website to get them.
If you don't know how to find the card driver details, they can be in a slightly different place on different versions of Windows, but if you go through something like Control Panel >> System & Maintenance >> Hardware >> Device Manager, (Device Manager is always what you are looking for), you should find it under Network Adapters.
Right-Click >> Properties >> Driver tab. That tells you the version, so check on Buffalo for later and download it if there is one, as the "Update Driver" button expects you to know where the new one is.
My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost.
Internet connection - IDNet Home Starter Fibre.
Live BQM.
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.