These things usually happen due to malware, spyware, adware, etc. However, they also sometimes occur due to system corruption.To fix all those errors, you will have to use the tools that can forcibly delete undeletable files on Windows PCs.1. FileAssasin2. Unlocker3. IObit Unlocker4. XL Delete5. File Governor6. EMCO UnLock IT7. LockHunter8. BlitzBlank