.NET Framework 4 Installation Error: No signature was present in the subject

After trying to install .NET framework multiple times, it hasn't worked yet. I can't find a solution that works, so I decided to post here. I am running Vista with Service Pack 1, and the log file can be downloadedhere. I ran the standalone installer, because of issues I had downloading the necessary files during setup. If there is any more information you need, just say so.

Question Info

Last updated July 4, 2019 Views 13,242 Applies to:

Hi B3tturTh3nU,


Step 1: Run the System Update Readiness Tool (Checksur.exe). To do this, follow these steps:


To resolve this issue, run the System Update Readiness Tool (Checksur.exe). To do this, follow these steps:

1.   Download and run the System Update Readiness Tool. This tool runs a one-time scan for inconsistencies that may prevent future servicing operations. For more information about how to download and run the Checksur.exe tool refer the link below

Description of the System Update Readiness Tool for Windows Vista


Step 2:Run the fixit available in the link below to reset windows update components.


How do I reset Windows Update components?



Now try to install dot net Framework

Refer the link below


Error message when you try to use the Windows Update or Microsoft Update Web sites to install updates: "0x800B0100"



Thanks and Regards:

Ajay K

Microsoft Answers Support Engineer

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