dot net framework 4.5 installation error fix

dot net framework is there already pre installed in windows 8 and above but sometimes when you try to install it in windows 7, it shows some error.
Here is the easy and 100% working solution for this error-

1. Click Start, Run, type: cmd and press Enter. Please run the following command in the
opened window.

net stop WuAuServ

2. Click Start, Run, type: %windir% and press Enter.
3. In the opened folder, rename the folder SoftwareDistribution to SDold.
4. Click Start, Run, type: cmd and press Enter. Please run the following command in the
opened window.

net start WuAuServ
 And now your framework will install as normal.
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