Excel 2003 opens slower across the network

Symptoms:
After you install MS11-021 and the Office File Validation (OFV) Add-in for Office 2003 (KB 2501584), workbooks stored in a network location open slower over the network in Excel 2003 than they did without the OFV installedcompare to open from local drive.

Cause:
The OFV reads the file to determine whether the file is trustworthy before it opens the file. When this is done over the network it reduces performance because of the network traffic when reading in the parts of the workbook.

Solution:
You can use the EnableOnLoad registry entry to configure how you want Excel to handle opening workbooks for the OFV. By default, the EnableOnLoad entry is not present in the Windows registry.

1. Start regedit


2. Locate HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\


3. Add New Key: Excel


4. Under Excel, add New Key: Security


5. Under Security, add New Key: FileValidation


6. Under FileValidation, add DWORD Value: EnableOnLoad with default value is 0 which disables the validation.

Or you can create a reg files contain below text and execute them

Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileValidation]"EnableOnLoad"=dword:00000000

More Info: http://support.microsoft.com/kb/2570623