Utilizing a Micro$oft MN-510 wireless with Prism2 chipset. Laptop is Dell Inspiron 5000e.

After booting and running dmesg, does not see usb device.
Modprobe prism2_usb works fine, and it locates the device.
Run a usbview, and the adapter shows.
Tried adding (as other posts suggested) /etc/network/interfaces then
adding iface wlan0 inet dhcp
Interface will not show up.
try iwconfig, ifdown, ifup, etc. and all claim no network card exists.

I know is must be something easy I am missing?