
The methods may not be effective if the appropriate service pack is not installed. For Windows NT 4.0, SP6 should be installed. For Windows 2000, SP2 should be installed. Before using these methods, verify that the service pack is installed. The method to use depends on the specific issue. There are five specific methods used to fix the “Windows Installer Service Could Not Be Accessed” error message. Methods Used to Fix “Windows Installer Service Could not be Accessed” The error might also occur if the Windows Installer is attempting to access a folder or registry key that the system account does not have Full permission to access, but this occurrence is only NTFS-specific. It can also occur if the default authentication level is set to None in the DCOM permissions and the default Impersonation level is on Anonymous. The error message may happen when Windows XP is in Normal mode and the Windows Installer Service in Windows XP is damaged or unregistered. Contact your support personnel for assistance.” This can occur if Windows is running in safe mode or if the Windows Installer is not correctly installed.

The error message typically appears as: “The Windows Installer Service could not be accessed.

If the Windows Installer is corrupted or the service stops for an unknown reason, an error message comes up. It installs, uninstalls, and supports applications and software. Windows Installer is a very important component of all Windows operating systems.
