I am receiving error, “BEI is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. The specified network name is no longer available.”, when I attempt to browse my network using Network Neighborhood. I am receiving this error only on computers that have Avast (Managed Version) installed. The following link is a Microsoft page that states Trend Micro causing the problem. Since this problem is occurring only on Avast installed computers, I am led to believe that Avast is causing me to receive the above error. FYI: I am running a Windows Server 2003 Active Directory domain. My workstations are a mix of XP Pro and 2000.
http://support.microsoft.com/?scid=kb;en-us;318245&spid=1173&sid=73
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Article ID : 318245