The Dell utility does not do that much (in terms of features added).  Consider removing it and letting Windows 7 manage the wireless connection.
Hello All, I received my Windows 7 upgrade discs today and when I popped in the Windows 7 upgrade assistant disc, it scanned my system for incompatible software. Dell Wireless WLAN Card Utility was the only item on the list. The message reads: "A Windows 7 compatible version of this software is not available in the upgrade DVD. Download a Windows 7 compatible version of this software from the vendor's web site." I've Googled this and searched the Dell web site and forums but have not seen anything about this. Has anyone else experienced this issue? I am running 64bit Vista Home Premium Edition on a Inspiron 1545 laptop.  Any help with this would be greatly appreciated. 
Dell Wireless WLAN Card Utility & Windows 7