I can't open or delete my video folder on my computer, it says "not accessible" help?

I have windows vista and a video folder with files in it that i had wanted to delete but when i try to open it i can't open it it says "unopenable & not accessible because the file directory is corrupted or unreadable". when I try to delete it it says "you need permission to preform this action" which makes no sense cause it's my computer, I am the only one who uses it and I am the administrator. So what is wrong with it and what can I do to get rid of this file? I tried it it safe mode I get the same message and I tried CCLEANER which messed up my computer more and still would not delete this file.