[ERROR: "You must use "Turn Windows features on or off" in the Control Panel to install or configure Microsoft .NET Framework 3.5 SP1."]

Now it works.

Many thanks for you help.

[ERROR: "You must use "Turn Windows features on or off" in the Control Panel to install or configure Microsoft .NET Framework 3.5 SP1."]

Are you looking in "Turn Windows features on and off" or in "Programs and Features" at the general list of programs that can be uninstalled? The two are very very different, although nearby each other.

Oh, I was looking to a wrong place. I'm sorry. I found "Turn Windows features on and off". It looks as below:

What do I do here now?

[ERROR: "You must use "Turn Windows features on or off" in the Control Panel to install or configure Microsoft .NET Framework 3.5 SP1."]

Did you try going to the Control Panel, finding "Turns Windows features on or off", and finding "Microsoft .NET Framework 3.5 SP1" in the list?

There is no such item in the list.

The relevant ones in the list are:

• Microsoft .NET Framework 4 Client Profile
  
• Microsoft .NET Framework 4 Extended
  
• Microsoft .NET Framework 4 Multi-Targeting Pac
  

There is no item related to .NET version 3.5.

[ERROR: "You must use "Turn Windows features on or off" in the Control Panel to install or configure Microsoft .NET Framework 3.5 SP1."]

Tried to install the version: 3.5.10

Operating System: Windows 7 Ultimate x64 SP1 (up-to-date)

What does this error message mean? What should I do?