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Steps to fix Osetup DLL errors: Fix this error to run Microsoft Office again

Osetup.dll is a “Dynamic Link Library” (dll) file used by the Microsoft Office suite. This file is typically used to control the various components and plug-ins that Office requires to run and is used every time you use an Office application on your PC. Unfortunately, this file is also a big cause of errors for your system as it continuously gets damaged and corrupted. To make sure this is not a problem for your PC, you should use the tutorial on this page to fix it.

The errors that Osetup.dll normally displays are the following:

  • “This application failed to start because osetup.dll was not found. Reinstalling the application may fix this problem.”
  • “can’t find [PATH] osetup.dll”.
  • The digital signature X:outlookr.WWOsetup.DLL is not validated or is missing.”

The first step in curing this error is to manually start the Office installation that you might have been trying to do. If Office was “running automatically” from the CD, then most likely your PC was unable to read the various files on the CD. This is a big problem and is often the cause of the OSetup.dll error. To fix this, you need to click on your PC CD and then search for “Setup.exe”. This will load the settings and files you need.

If this doesn’t resolve the issue, you should look into copying the installation files to your hard drive and then running the installation from your hard drive. You can do this by clicking on the CD and then copying all the files on it. You then need to find a hard drive and paste the files onto it, allowing your computer to read the files it needs to complete the installation in a central location.

After this, clean the registry with a “registry cleaner”. This is highly recommended since your computer’s “registry” is where Windows stores the files and settings that your computer and programs need to run. The registry is a large database that plays a vital role in the setup and operation of your computer. However, because Windows continually uses this database, your PC constantly gets confused and saves many parts incorrectly. To make sure this isn’t a problem, you should use a registry cleaning program to scan through this database and fix the various errors found within, allowing your PC to read the files it needs and work (much) better as a result.