I’m currently having a problem trying to install an update to my Windows 7 Professional 64-bit laptop. This whole situation started when I kept getting errors when trying to install an update for my laptop. The update is KB2446708. This is a security update for Microsoft .net 4.0 framework. The update kept ending with error code 66A in the Windows Update application.
At first I tried to repair Microsoft .NET Framework 4 Client Profile by going into the appwiz.cpl console and running repair. This ended up failing with the following error: “Installation failed with error code: (0x80070643)”. I did some searching on this particular error and found that it is most likely caused by incorrect registry keys. So, I checked my keys:
Both keys had the right value associated with them. So that could not be the problem. The next thing that I did was to uninstall Microsoft Silverlight. Once that was uninstalled I tried to repair the program again. But to no avail. From there I decided to just uninstall Microsoft .NET Framework 4 Client Profile and reinstall it. But during the uninstallation process it gets interrupted by a failure. This would be the same failure as when I tried to repair the program. Again the error is: “Installation failed with error code: (0x80070643)”. I know that this error is quite generic so I have also attached my log file from uninstalling. I ran a program called collect.exe that supposedly collects all of the error information and compiles it into one neatly organized zip file, but experts-exchange would not let me load the zip file because one of the directories was called ".NET". So I can upload you certain files or email the whole zip directory if you want. Just let me know. Can anyone help me with this?