The drive that contains the folder that you are trying to install the Windows Installer package to is accessed as a substitute drive.The folder that you are trying to install the Windows Installer package to is encrypted.Windows Installer is attempting to install an app that is already installed on your PC.You may receive this error message if any one of the following conditions is true: If you click OK in the message box, the installation rolls back. When you try to install a Windows Installer package, you may receive the following error message:Įrror 1603: A fatal error occurred during installation.

Some users are reporting issues with uninstalling the updates, saying Windows won't let them or that the updates are automatically reapplied after they're initially uninstalled.įor those who've yet to download the cumulative updates but fear for their VPN connections' stability, the question boils down to whether you want to live without the cumulative updates' numerous vulnerability fixes until Microsoft takes official action.This article helps fix the error 1603 that occurs when you install a Microsoft Windows Installer package.Īpplies to: Windows 10 - all editions Original KB number: 834484 Symptoms You can uninstall the updates with an elevated command prompt. It's the simple strategy of uninstalling KB5009543 and KB5008876 and living without their security updates until patches come along that don't mess with VPN connections. The fix, for the time being, is straightforward, though it doesn't come from Microsoft. Rather, it's seeming to hit those using Windows' built-in VPN client. It's worth noting this unintended side effect of Patch Tuesday isn't affecting all VPN users.

The message users get hit with when attempting connections reads 'the L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.' Windows admins over on Reddit are reporting the issue affects SonicWall and WatchGuard connections, among others (via BleepingComputer). But while the updates helped alleviate Windows of numerous vulnerabilities, they've also had the unforeseen consequence of borking some PC users' VPN connections. In case you missed it, January 2022's Patch Tuesday came and went, bringing with it fresh updates for Windows 11 and Windows 10.

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