I was having issues connecting to the Internet with my Windows 7 laptop using the MiFi 2200 as a WiFi device.
My WiFi adfapter was retaining the last IP Address it had obtained ... in my case my home network.
Go to a command prompt and do an ipconfig -release followed by ipconfig-renew.
It pulls an address from the MiFi from the DHCP range and works perfectly.
Hope this works for everyone!
Maybe also check specific for the 2 different tcpip protoclas loaded.. here is the solution that resolved my connection issue:
Updated Vista Home sp1 to sp2 ( 450+MB download )
Updated Atheros AR5007 drivers to 7.6 , 2008 release... there might be a newer release but I dont want to jack with it now that I'm working.
Check in network connections for wireless connection.
I had 2 TCPIP protocols loaded. v6 and v4 .. v4 had IP and DNS hard set. changed both over to auto assign
WALLA Mifi is now working wirelessly.