Windows 8 error 0x800f0906 while enabling Microsoft net framework 3.5

Had a problem with the Citrix receiver requiring .Net 3.5 but being unable to add it dynamically or through control panel. Downloading from Windows update failed.

James Massardo helped me find the solution:

1. Mount the Windows CD as an ISO or physical disk
2. Make a note of the Windows ISO or disk drive letter
3. Run a command prompt as an administrator
4. Run 'dism.exe /online /enable-feature /featurename:NetFX3 /Source:d:\sources\sxs' replacing d: with you disk or ISO drive letter