Filevault Problems

Hello, I've been using FileVault for few days, and it was working perfectly.


This morning it wouldn't open, it says wrong password when trying to view the files via BitDefender app. That pass wasn't changed or touched, and it worked before.


When I try the Lock vault option, it doesn't show it on the list, instead when i find the vault file on my HDD and select it for locking, it says that it is Opened on A: and that it can't close because there were open files detected on that drive, and to close them. Computer was shutted down, restarted, and i dont have access to A:, even via Command prompt. Also can't think of any program that might be using the documents in vault.


Vault have roughly about 100GB and 80% is used with files.