i just got the game l4d2, actually someone gifted it to me

so i played 5 min got a little bored then went looking for custom skins
i found many and started to dl skins and tools because i always customize games.

long story short. i tried to move one of the .vpk skin files and i accidently clicked it.
with no warning or asking a popup window appears and "skin sucsessfully installed"
im like "what?! i didnt want to install anything"

so now ive got a custom player skin i do not want.
i cannot find the files anywhere so where is it?
how do i remove a custom player skin?

i still cant believe a skin got installed cuz i clicked a file
i just want the default back

heh after days of searching i finally found the right folder where the files got placed.
its been so frustrating but i was able to remove the skin

now to start editing my own