Why can't I start a Microsoft Office application after installing Windows 2000 Service Pack 3 (SP3)?

A. Some users have received the following error message when they attempt to start an Office application after installing Win2K SP3:

The Windows Installer Service could not be accessed.
This can occur if you are running Windows in safe
mode, or if the Windows Installer is not correctly
installed. Contact your support personnel for assistance. 

The problem stems from a new version of Windows Installer (version 2) that ships with Win2K SP3. You might receive this error message for one of two reasons. Each reason has its own soution, which I detail below.

DCOM Default Impersonation Level Is Set to Anonymous

  1. Start the DCOM configuration utility by typing at the command prompt
  2. Select the Default Properties tab, then select Connect from the Default Authentication Level list.
  3. Select Identify from the Default Impersonation Level list, then click OK.br>
    Click here to view image
  4. Close the DCOM configuration utility.
  5. Start Windows Explorer and navigate to the system32 folder (e.g., c:\windows\system32).
  6. Right-click msisip.dll, select Rename from the context menu, change the filename to msisip.old, and click OK.
  7. Reinstall Win2K SP3.

The SYSTEM Account Doesn't Have Permission to Access a Destination Folder

  1. Start Windows Explorer, right-click the boot partition drive (typically the C drive, where the Windows folder resides), and select Properties from the context menu.
  2. Select the Security tab.
  3. Click Add.
  4. Select the System account, click Add, then click OK.
  5. Select the Full Control option under Allow and click OK.
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