patch.dll
DLL File Repair Steps for Windows Service Packs

While running a Service Pack update, I get an error on my computer that says "PATCH.DLL is missing. Replace the file and try again." What is the patch.dll file for?

Patch.dll is a component of the Microsoft Windows Service Pack upgrade. Service packs include update information for program compatibility, system reliability, security and other pertinent functions of the Windows OS. The patch.dll file is normally called upon during the upgrade and then subsequently deleted from your computer.

If you're having an issue with your patch.dll file, the exact message displayed will vary depending on the application that is attempting to access it. Here are a few examples of messages you might receive:

• "The dynamic link library patch.dll could not be found in the specified path"
• "Missing component patch.dll"
• "This application has failed to start because patch.dll was not found"
• "patch.dll is not loaded"

What causes patch.dll error messages?

Errors like the ones above can be an indication that the patch.dll file has been corrupted in such a way that makes it impossible for the service pack to access it.

What can I do to fix this issue myself and get my software working again?

Unfortunately, this file isn't included with Windows Vista installs so it won't be found on one of your backup/restore disks. Some users have been successful at finding a copy of the patch.dll file online and saving it into the appropriate folder on their PC (in this case, the C:/windows/system32 folder). Download a replacement file here.

IMPORTANT NOTE: This means of adding the missing or corrupt dll file is not officially supported by Microsoft or DirectX and should be performed with caution.

If I don't fix this, what will happen? Will my computer have other problems?

If you choose not to fix this, any applications that access this file simply will stop functioning for you. Driver Detective may help, a Driver Detective key is available as well. Error messages of this sort are often only the first indicators that your PC's operating system is in need of some attention. Every time you install or remove an application from your computer, important files and registry entries are altered. In time, these small changes compound and Windows has difficulty making sense of the data. Unfortunately, correctly identifiying and remedying issues with a computer's operating system is a task usually far beyond the average user's skill level. If you are experiencing a “patch.dll missing” error, we highly recommend a free file health scan of your computer to look for other issues that may also be contributing computer's problems and go from there.

Our users have sent in emails requesting additional resources for computer issues. These can be viewed here and here. Resources for internet security issues can be viewed here and here.

 

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