i have the same isp and router.
i also have the same problems.
i am supplying a link to the brouchure ecerpt below,
because it tells me that i can ONLY use Westell, and D-Link wlan cards
to "talk to" and be "talked to from" the router.
this just kicks me because i have an option to get a laptop to run linux on and the internal wlan won't work with verizon's MI424WR wireless router.
i wasted the time of some of these knowlegdable people with this problem
using a dell optiplex gx810(very old) with a linksys wmp11 wlan pci card.
i did check this verizon router with a d-link pci wlan card and it worked.
link to verizon brouchure excerpt.