I have 4 computers and a QNAP TS-209 NAS in a WorkGroup environment. Two of the Windows 7 computers see everything - the 3 Windows 7 computers,the Windows XP computer, the TS-209 and the OKI C5100N printer. One of the Windows 7 computers only sees other Windows 7 computers (just as if it were in a homegroup). All the computers have the same workgroup name and all users are the same on all computers (username and password). I can't find any setup differences between the Windows 7 computers that work and the one that doesn't. The only difference is the one that doesn't is running 64-bit Windows 7 and the others are running 32-bit Windows (7 and XP). I've tried everything I can find on the web to no avail.