It took 24 hours just to install the game? You may have a poor internet connection and the installation process may have been corrupted. Use Steam to verify the game data.
go to game library on steam, right click on the elder scrolls skyrim, go to properties, there is a tab for local files; go there, and then there is a button to "verify integrity of game cache" and click on that
if there is any corrupt files they will be replaced with the right one via download. so you don't have to redownload the entire game just whatever files are corrupt.
this is not only for skyim it can happen to any game on steam.