close tf2, make yourself an administrator account

It's an issue with windows being screwy with fonts, saying they can't be deleted because they're "in use" even when they're not. Everything else in your folder should be deletable.

Safe mode and deleting, safe mode and renaming after changing permissions, closing windows explorer and deleting through commandline, removing its registry references (scroll down a bit), are all potential solutions. I had the issue once and fixed it, but I forget what I ended up doing.

i had the same issue with my windows 10 prompts telling me i needed admin privileges even though i am the only user and admin on the pc. i wound up reinstalling Steam and TF2 to another location and played from there, still not sure how to remove the old folders though.

tell me, do you have intel integrated graphics on ur computer, because if so, you should open task manager and end the task named igfxEM Module, for some reason it really likes the files in tf2 custom folders (i had this problem myself and this is what fixed it)

Yeah i got this same problem after updating to the creators update

Thanks this worked for me :)