I have theat same adapter,

I had a similar problem BUT I always use te Windows Wireless Utility and not Buffalos.

I'd recommend removing Buffalos and Use the Windows one.

You could try removing all Wireless profiles that are stored in the Buffalo Utility as well as Windows one if you use it.

You can remove the utility but leave the drivers installed.

Uninstalling the software does not remove the profile so remove the profiles first then remove.

Hope this helps

Chris.