- What causes Windows Update Error 0x80070020?
- Error 0x80070020 means 'The process cannot access the file because it is being used by another process.' A running program, antivirus, or a previous failed update has locked a file that Windows Update needs to replace.
- Is this error dangerous?
- No. It's a locking conflict — Windows just can't overwrite a file that's currently in use. Your system is functioning normally.
- How do I fix Windows Update Error 0x80070020?
- Restart your PC (without 'fast startup'), which releases all file locks. Then retry Windows Update. If it fails again, temporarily disable your antivirus real-time protection during the update — security software commonly locks files that Windows Update needs to replace.