I bought two Sweex plug'n'play USB speakers sometime last year. They worked well with my XP OS.
I've just upgraded my PC with a Windows7 64bit. They're recognized in Device Manager as speakers and everything seems fine, other tyhan that they don't play. No sound, under Manage audio devices>2 Speakers>Advanced & press 'Test'.
"Failed to play Test tone".
What can I do?!