How To Fix Error Code 643 For Windows 7
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we highly recommend that you visit our Guide for New Members. Solved: .NET Framework Update and Install Fails Discussion in 'Windows 7' started by BML, Oct 8, 2014. Thread Status: Not open for further replies. Advertisement BML Thread Starter Joined: Nov 24, 2001 Messages: 664 My windows 7 system had .Net Framework v. 4.5.1 installed and windows update notified me of a security update. Every time I try to install it, it fails with an error code 643. I did some googling and found a couple of things, including a Microsoft Fix-It (that didn't work) and a .NET Repair tool (that didn't work). So I went and uninstalled it completely. Then windows update shows an update available of course, the .NET 4.5.1 so I re-installed and it failed the install. When I re-boot I get an error saying I need to install .NET 4.0.30319. what's going on? Why does it keep failing the install? BML, Oct 8, 2014 #1 Sponsor flavallee Frank Trusted Advisor Joined: May 12, 2002 Messages: 70,137 Microsoft .NET Framework 4.5.2 is the most current version for Windows 7. Download and save the full 66.8 MB file, then close all open windows first, then install it. --------------------------------------------------------- flavallee, Oct 8, 2014 #2 BML Thread Starter Joined: Nov 24, 2001 Messages: 664 I just tried it. It failed just like the others did. I zipped and attached the error log. Attached Files: dotnet error log.zip File size: 410.4 KB Views: 83 BML, Oct 8, 2014 #3 BML Thread Starter Joined: Nov 24, 2001 Messages: 664 Any ideas? Anybody? Could it possibly be because I do not have .Net 3 or .Net 2 installed? According to my program list I only have .Net 1.1. I tried to install both 4.0 and 4.5.2 and they fail with a fatal error. I'm wondering if they require the previous version. BML, Oct 21, 2014 #4 flavallee Frank Trusted Advisor Joined: May 12, 2002 Messages: 70,137 Microsoft .NET Framework 3.5 SP1 comes as part of Windows 7. 3.5 SP1 also contains versions 2.0 SP2 and 3.0 SP2. None of those 3 versions will appear in the "Programs And Features" list. -------------------------------------------------------- flavallee, Oct 21, 2014 #5 plodr Liz Joined: Jun 27, 2014 Messages: 8,396 Go here and download and install the .NET verifier tool http://blogs.msdn.com/b/astebner/archive/2008/10/13/8999004.aspx You should have .NET 3.5 because it is part of Windows 7. .NE