So when I try to activate mods on the mod manager, for instance Darnified UI. It says that the mod script is invalid and that the mod will not activate. This happens for all other mods I try to download, please help

windows 7 64 bit (not sure it matters but whatever)

Edit: I have also heard NMM looks for oblivion in the steam folder, Is this the problem?

NMM is not 100% compatible with Oblivion. I recommend you use Bash instead.