Installer Error 1001

I cannot install software of any type whether it is a downloaded file or from a cd. The codes I receive are:

Error 1001 InstallUtilLib.dll 

MSI install exception occured  error 1001

The dll error shows up most often. I haven't had much luck with trying to find a replacement dll. I have done registry cleanup with Norton 360. System File Checker didn't help. Thanks for suggestions.

Question Info

Last updated July 19, 2018 Views 35,494 Applies to:

Hi LBennett610,



1.     Have you made any recent changes on the computer?

2.     When was the last time it was working fine?

3.     Do you have any security software installed on the computer?

4.     What was the result of SFC scan on the computer?


Check and make sure that Windows installer service is running on the computer.

a)    Click Start, click Run then type services.msc and then press Enter to open Services.

b)    Right-click the Windows Installer service, and then click Properties.

c)     If the Startup type box is set to Disabled, change it to Manual.

d)    Click OK to close the Properties window.

e)    Right-click the Windows Installer service, and then click Start. The service should start without errors.

f)     Click the File menu, and then click Exit.


The file InstallUtilLib.dll is related to .Netframework on the computer.

Check the version of .Netframework installed on the computer by using the Add\remove programs list.

Also check if there are any updates for .Netframework available in Windows update and install them ,check if it helps.


If the above step fails then refer the below Microsoft article and try the steps mentioned, check if it helps.

When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0, or 3.5, you may receive Windows Update error code "0x643" or Windows Installer error code "1603"


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