Turn off/uninstall HDLODs. Also, pure texture mods can't conflict by nature (except in style and/or colour ;x) - they simply overwrite, but if said mod is using some weird LOD thing, then I don't know. :)
(Haven't had a computer for a while, so don't quote me xP) Just go to the mod directory (wherever you installed NMM as default) or right click on any mod in NMM and select it. :)