Unable to install .net 3.5 on windows 8

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When Unable to install .net 3.5 on windows 8 even after running the appropriate command using dism.exe to enable net 3.5 and getting the “access denied” error running:

dism.exe /online /enable-feature /featurename:NetFX3 /Source:d:\sources\sxs /LimitAccess

to solve this just Start <run < all programs  < accessories < command prompt (right click) < choose “run as administrator” < run the dism.exe command again.