Crashing while accessing folders

[Windows Server]

I can open file explorer but whichever folder I click will just cause crash and freeze. While I tried the command chkdsk C: /r /scan this message popped up: Access Denied as you do not have sufficient privileges or the disk may be locked by another process. You have to invoke this utility running in elevated mode and make sure the disk is unlocked.Yesterday I cleaned up the drive C because it kept filling up for no reason. I mostly deleted unused files from the Downloads folder and saw that I have 3GB left, but at the time of writing this it shows that I only have 13MB left although I cannot a

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