uninstall the buffalo stuff
then go to start>run>and type "msconfig" without the quotes
then go to services, and go right to the bottom and tick "wireless zero configuration".
then go to start>run>and type "services.msc" without the quotes. go down to the same wireless zero configuration thing as above. double click it, and make sure its set to automatic, and is started.
then it should work fine
hope that helped