If your version of Symantec Event Handler driver (Symevent.sys) is outdated, or if there is a Computer Associates (CA) INO_FLTR.SYS OpLock interoperability problem with the Srv.sys file, you will experience various problems when you work with files over the network on your server?

The following file versions are known to cause problems:

<font size="1">Symevent.sys  Symantec Corporation  11.4:0.6      05-Mar-2004   Symantec Event Library
Symtdi.sys    Symantec Corporation  5.3:6.13      23-Dec-2004   Network Dispatch Driver
Ino_flpy.sys  Computer Associates   5.0:6100.106  19-Jun-2003   CA eTrust Antivirus/InoculateIT File System Mounting Filter Driver
Ino_fltr.sys  Computer Associates   5.0:6100.136  08-Aug-2004   CA eTrust Antivirus/InoculateIT File System Filter Driver</font>
See 10484 » Hardware and Software Third-Party Vendor Contact List.

For additional information, see Microsoft Knowledge Base article 923360:
You may experience various problems when you work with files over the network on a Windows Server 2003-based or Windows 2000 Server-based computer