just wanted to share my experience with you.......
problems with the bc card may not be related to the card or its settings/peripherals, it might be the display!!! as foolish it´s sounds.........
I had big problems with my new lenovo b590 getting and using proper wlan connections with isadora
in XP everything seemed fine
just after a smooth cleaning of the display with a ordinary soft tissue (with some water on it) my connection
went straight from 30/40 percent to a 100% stable (even in my backyard!!!)
sounds real crazy, but I swear telling you no joke!!
so you might just give it a try........
let me know if it helped somebody!