One of our biggest issues with migrating to Windows 7 has been the problem of laptops needing to logon before the laptop would connect to the wireless. Therefore it was impossible to logon as a domain user using only a wireless connection.
Finally, we found a simple solution.

1.

Set up a wireless profile.

We use a WPA-2 PSK with AES. But use whatever best suits your needs.
2.

Check your WLAN profile name.

In a command prompt, get the name of your profile by running netsh wlan show profile

Wlan_cmd_big

3.

Create a regisrty entry

run regedit

Find the HKLM\Software\Microsoft\Windows\CurrentVersion\Run registry key.

Add a string value to the above mentioned key. Call it anything (WLAN prelogon), but its value should be
%comspec% /c netsh wlan connect name="<profile name>"

Of course, replace <profile name> with your profile name that you previously created.
4.

Add to GPO

If you have a lot of computers to configure for this, add it to Group Policy.
Add it to Computer Config > Preferences > Windows Settings > Registry. (see attachment)

Wlan_prelog2_big

5.

Update Group Policy

run gpupdate /force /boot on all computers that you want updated. This will create the registry entry and reboot.


Conclusion

As long as the wireless hardware switch is turned on, the computer will now connect to the wireless network before any user logs on. Therefore, a domain user logon will now work wirelessly.


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http://community.spiceworks.com/how_to/show/2047-enable-wireless-connection-pre-logon-on-domain