Both belong to your Dlink wireless router software
AirGCFG.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows XP are 1249280 bytes (26% of all occurrence), 1236992 bytes, 1245184 bytes, 1544192 bytes, 2715648 bytes, 1216512 bytes, 1228800 bytes, 2711552 bytes, 25600 bytes.
The file is not a Windows system file. You can uninstall this program in the control panel. Program is loaded during the Windows boot process (see Registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run).
Try reinstall the router software that came onCD with the router.