I'm having a very annoying problem with two handed weapons such as, hammers, claymores, etc, using the one handed running animation. What I mean is, like while I wield a claymore and I run, it looks the size of a shortsword, and is carried with only one hand like so. I'm not sure if this is caused by mods. I disabled most of my mods, minus the official patches, and it still does it.

Look in Oblivion\Data\meshes\characters\_male for kf files, they are usually labeled by the animation they change, You can delete them or move them to a folder outside of Oblivion for reinstalling them later.