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This behavior may occur if the temporary folder of Windows Update has been corrupted. We can refer t
win 7 64位系統上安裝.NET Framework 4報：尚未安裝 .NET Framework
解決：1、以管理員方式運行cmd2、在cmd命令行里輸入：net stop WuAuServ3、在運行輸入%windir%（如果這一步不能顯示，直接按step4的路徑找）4、在彈出的文件夾（如C:\w
