Medium
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
How to fix error error-is-substed in Windows 11
ERROR_IS_SUBSTED = 135
Fix based on community reports and expert analysis. Last verified: 2026-08-12
· How we verify fixes
| Error Code | error-is-substed |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Medium |
| Estimated Time | 10 min |
| Requires Admin Rights | ⚠️ Yes |
| Requires Reboot | 🔄 Yes |
Solution Steps
- 1 Press Windows key + R, type 'cmd' and press Ctrl+Shift+Enter to open Command Prompt as administrator.
- 2 Type 'subst' and press Enter to list all current drive substitutions. Identify the drive letter that is causing the error.
- 3 To remove the substitution, type 'subst [drive letter]: /d' (e.g., 'subst E: /d') and press Enter. This removes the virtual drive mapping.
- 4 If the substitution was created via a script or startup, check Task Scheduler or the Startup folder for commands that use 'subst'. Remove or modify them.
- 5 Restart your computer to apply the changes.
- 6 If the error occurs in a specific application, check if the application has settings that reference the substituted drive. Update the application's configuration to use the actual folder path instead.
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