Season expansion messed up all my other sims 3 games

I went out and spent $80, bought supurnatural AND seasons- I installed supurnatural with no problems but after I was done installing seasons I kept getting these "Missing Shortcut" error meeages from all of my icons. I can't get launcher up and i'm really annoyed because I did everything correctly, and i've looked around and have no idea how to fix it. I can't locate the files. I uninstalled it and tried to reinstall seasons but now I get an error saying something's corrupted. I'm not sure what to do i'm extremely frustrated and it's just getting worse- I can't re install everything like my base game (due to not being able to find it ) or two of my other expansions.  Please help!