Steps to resolve the issue of Windows 7 being unable to install Microsoft .NET Framework 4:

1. Click Start—type services.msc in the Run box and press Enter;

2. Select Windows Update, right-click and select Stop;

3. Click Start—type cmd in the Run box, select cmd, right-click and select Run as administrator;

4. Open the command prompt window, type net stop WuAuServ, and press Enter;

5. Click Start—in the Run box, type %windir%, and press Enter;

6. Locate the SoftwareDistribution folder and rename it to SDold;

7. Click Start—type services.msc in the Run box and press Enter;

8. Select Windows Update again, right-click and select Start. Now you can install Microsoft .NET Framework 4 normally.