What if I can't delete a file, etc. (in detail)?

Question

Windows

I have such trouble. I can neither download nor delete the file, if I download something the browser crashes, no need to advise any other use does not help (I have Yandex). If I delete a file, I get an error: "The file could not be deleted due to an unexpected error. Error 0x80070091: The folder is not empty." If, for example, I delete Steam, this pops up: Could not delete the file due to an unexpected error. Error 0x80070570: The file or folder is corrupted and cannot be read. I still run the installer of the same steam and this appears: error can't initialize plugins directory please try again later. WHAT TO DO?
Windows 7 32bit

Answer 1

Run a disk check with troubleshooting