ok im having some SERIOUS TROUBLE, it all started when my virus remover popped up for the daily checking, well because of that Terraria Crashed, and when i (attempted) to open it up again it said (Unknown Error) on steam, so heres a picture of my terraria folders, after i deleted all the files in there, re installed it, put the tmodloaders files in it
and everytime i tryed to launch terraria it always removes the tmodloader terraria.
ok heres what happened when i put the tmodloader terraria and try to run it

also when i put the original terraria in, it plays the original no tmodloader, seriously please reply quick because i REALlllY want to play