Error+codes+when+you+try+to+install+.NET+Framework


 * Error codes when you try to install .NET Framework **

If you receive an error code 0x80070643 or 0x643 when you attempt to install the .NET Framework updates through Windows Update or Microsoft Update, or if the same thing happens when you try to update your malware signatures in Microsoft Security Essentials, it may be that your computer has system corruption such as a corrupted disk sector, or other applications might have overwritten the .NET files. To troubleshoot the problem, you have to fix these issues. You will find instructions for doing so in KB article 976982.