First thing - dump the MSI config utility. That's stopping the Windows XP Wireless Manager from working. Then go to your MSI card in 'Connections' and right click on it, then select Properties. You are now into the XP pages that control the WiFi Connection. Select the Wireless Network Tab and select your network and choose Properies then Connection and tick Connect when in Range. Now look in Advanced and make sure you select Access Point only.
Go to View Available WiFi and see if your WiFi is listed. If you select Connect it will do that (if you have enabled encryption you will be asked to enter the Key now and you can remember it for future use).
You must use some form of encryption!
You will have XP's Firewall running unless you have disabled it. Leave it running.