To clarify, what number of mods are we talking in general? You know there is a hard limit of 244 .esp files the engine can handle? If you´re below it, skip this. Are you using more mods from the bethesda-page, or only the 2 ones, you cant load? If the 2 are the only ones, something may be wrong in general, either on your end, or on bethesda´s page. If the 2 are 2 of more files, check if they are still listed on the page. If not, that may be the problem. If they are sill there, try uninstalling them, and reinstall.