I did all the tweaks that you suggested earlier any my systems do not have an antenna diversity setting.
Also went to the Dell website and entered the drivers. Those were the drivers I had installed, but I also found newer ones which are installed now. Problem existed before and after the driver update.
Below are two interfaces that I created. The Dell Wireless 1506 drops connection but the Compact Wireless-G USB Adapter does not. The USB adapter came from the XP desktop that was having no trouble. The two wireless devices that are dropping are b/g/n devices and the ones which seem to hold their connection are 802.11g.
Name : Wi-Fi
Description : Dell Wireless 1506 802.11b/g/n (2.4GHz)
GUID : 0d38336e-21c1-48ec-9661-ad4e8420e67e
Physical address : 84:4b:f5:02:3f:3f
State : connected
SSID : TheShire
BSSID : 20:76:00:12:c1:24
Network type : Infrastructure
Radio type : 802.11n
Authentication : WPA-Personal
Cipher : CCMP
Connection mode : Profile
Channel : 1
Receive rate (Mbps) : 72.2
Transmit rate (Mbps) : 72.2
Signal : 94%
Profile : TheShire
Name : Wi-Fi 2
Description : Compact Wireless-G USB Adapter
GUID : ccc3542c-6627-41b8-b7f1-3a346771714e
Physical address : 00:18:f8:a4:aa:0e
State : connected
SSID : TheShire
BSSID : 20:76:00:12:c1:24
Network type : Infrastructure
Radio type : 802.11g
Authentication : WPA2-Personal
Cipher : CCMP
Connection mode : Profile
Channel : 1
Receive rate (Mbps) : 24
Transmit rate (Mbps) : 24
Signal : 73%
Profile : TheShire