AirPort Express works fine with OSx but not Windows
Purchased my AirPort Express 802.11n just couple months ago.
It was working just fine for all computers and mobile devices in my house.
Couple days ago, all of a sudden, My housemates' PCs started getting "slow internet, yet shows full signal strength". Note that my Macbook Pro has no issues. A PC in my room also has no issues using Ethernet.
My MBP is about 5 meters away from router with one door between them. My housemates' PCs are about 8-10 meters away from router. I brought my MBP over to their room and still get the same usual speed I got in my room.
Please advise. Really appreciate it. Thanks much.
MacBook Pro (13-inch Early 2011), iOS 9.2