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I am working on Microsoft Windows Vista 64-bit with Service Pack 2 (SP2) on an HP Notebook PC. I am not able to install update .NET Framework 3.5 Service Pack 1 as well as .NET Framework 3.5 Family Update (KB951847) x64. Windows Update prompts a reportedly unidentified error code 643 in addition to the update fails. So please if anyone knows how to get out from this problem then please suggest me about this over here.
To manually remove the .NET Framework you have to go to Start, and afterward select Control Panel. And then Double-Press on Add or Remove Programs. Make a note of every edition of the .NET Framework that is previously installed on the PC. After that, uninstall the entire the editions of the .NET Framework. While you are encountered, then you have to start the system again.
You have to take out the .NET Framework. Utilize the Windows Installer CleanUp service to clean out the MSI database position for the entire the editions of the .NET Framework. You have to install the Windows Installer CleanUp service like an administrator or as a user account that is a part of the local Administrators group. Then you have to press Start, then All Programs, and after that press Windows Install Cleanup. In the Windows Installer CleanUp service, you have to take out the entire Windows Installer applications for the .NET Framework. And then start the system again. Then Download in addition to then reinstall the entire the editions of the .NET Framework that were earlier installed on the PC.
To utilize the Windows Installer CleanUp service to clean up the MSI database position for the entire editions of the .NET Framework. You have to download the Windows Installer CleanUp service. This file is accessible for download from the Microsoft Download Center. Microsoft examines this file for viruses. Microsoft utilized the most present virus-detection software that was accessible. The file is accumulated on security-enhanced servers that assist stop any unauthorized alters to the file.
From my opinion you have to utilize the .NET Framework automatic cleanup tool. So try this may you got solution to your problem or you are able to make Enable Microsoft Installer logging as well as Windows Update verbose logging. You have to attempt to install updates once more to generate the log files. You have to disable Microsoft Installer logging as well as Windows Update verbose logging.