flang

Yeah, this is not the first time I've had trouble with .NET either. I have more than once gotten caught in an infinite reboot cycle after running a .NET upgrade program that refused to continue because a newer version was already installed (but that didn't stop it from shutting down my computer without asking). So regardless of any problem I have with any program, it's not at all difficult for me to lay the blame with Microsoft rather than the software developers.

Of course it doesn't matter for me since it's now working, but if the MO or plugin developers are going to be attempting a fix, they should know that I definitely restarted my computer after enabling .NET 3.5 in the control panel, along with a fresh reinstall of MO. You can see this in my reply back on the Nexus comments. So there must be some kind of difference between the two fixes somehow. I don't know what it is but it's just a piece of information for the developers if they plan on investigating this further. For clarification, even though I have implemented DoubleYou's registry fix, if I go into the Windows Features menu right now, the two .NET 3.5 options available (Windows Communication Foundation HTTP Activation and Non-HTTP Activation) are still shown as disabled even after doing a fresh system restart. Yet MO is working correctly.

So I think I understand what you're saying, but then why didn't the Control Panel fix work for me, while the registry fix did?

I'm not knowledgeable enough to understand this fully, but I will say that I undid SkyrimCliff's fix (enabling .NET 3.5 functions under the "Turn Windows Features on or off" menu). So, those features are currently disabled on my machine, but nonetheless MO is still working as it should.

This fixed it for me. The error disappeared and I was able to install "A Quality World Map" successfully. No computer restart required. (I already had SkyUI installed via NMM and didn't want to mess with it, but A Quality World Map also has a fomod scripted installation, and it was the one I was having trouble with before.) Thank you all for your help.

It looks like the registry hack may actually be necessary, since enabling 3.5 under Windows features did not fix the problem for me. (I posted a reply on the Nexus, but let's keep it here so we don't have to jump back and forth anymore.) Looking at my current Registry - my entries for \3.5 and \3.5\1033 already have this exact setup. My entries for v3.5, v4, and v4.0 are copied below directly from my registry, for verification: Like I said on Nexus, this isn't a big issue for me personally, since I can still use NMM. So don't stress it too much because it looks like it may be something screwy with my machine - a fix for which would only apply to me and thus wouldn't be worth a lot of effort on your end. In any case I very much appreciate the help from both of you.

I installed Mod Organizer using the .exe installer, with all default options checked. When starting Mod Organizer, there is an error notification that .NET is not installed or out of date. However, when I click on the provided link to download .NET 4.0, the setup program will not proceed because "a current or newer version of .NET is already installed." I originally planned to just ignore the error in MO, but I suspect that the MO plugin that requires .NET is not working, because when I try to activate mods like A Quality World Map with MO, the scripted installer for that mod doesn't run, and instead I get the error box in MO that says the base directory has no data files. However, when I activate this same mod using Nexus Mod Manager (0.55.8), the scripted installer comes up and the mod is installed correctly. I am running Windows 7 Pro x64 SP1, with .NET version 4.5.2 installed and verified today using the built-in Repair option in the control panel. UAC is deactivated. I have considered trying to uninstall .NET 4.5.2, then installing 4.0 instead, but I am worried this will cause problems with currently installed programs that may depend on 4.5.2 to function. If anyone has any advice I would appreciate it.