The drivers for XP install without issue and work well, except about every 24 hours the DWA-643 gets [exploitive deleted]. It can't see any APs nor will it allow you to repair the connection. So every 24 hours I am forced to reboot my laptop. I have rolled back the drivers to 1.21 and I am checking to see if the problem still exists. I am starting to think that the DGL-4500 with beta drivers might be the cause. Well the DHCP server might not be issuing the lease renew.
Update:
The card has failed. (tech support) notified