Delete Windows.Old Folder Windows 10

Removal in 5 Steps

Step 1. Go to Start and type 'Disk Cleanup'.
Step 2. Open Disk Cleanup and select your main system drive.
The tool will scan your drive for unnecessary files and old cached data. However the Windows.old directory won't be accounted for.
Step 3. Select the option "Clean up system files" near the bottom of the window. Select your main drive again and the scan process will be repeated.
Step 4. The result of the scan will display different types of data, from Recycle Bin files to temporary internet cache. This time around, "Temporary Windows installation files" will be there, accounting from as little as 9GB to as much as 25GB, or more.
Step 5. Select all the files you want to remove, including the Windows installation files. Click OK. Then confirm the subsequent prompts.