What are your computer specs? Which mods are you trying to use? Can't really help till you list those, as it could be the particular mod, or your GPU not being powerful enough to load large/extra textures. Running an i5 2500 oveclocked to 4.4Ghz, GTX580, 8 GB. I'm trying to run the 2k textures, realistic water textures and the flora overhaul. Thanks.