$WINDOWS.~BT or $WINDOWS.~WS folder are created usually in the root of Windows installation drive when windows 10 is upgraded. This folder contains a backup of last version of Windows. Such type of folders can also be created if you install Microsoft Office. This folder consume 5 to 6 GB of disk space and cannot be deleted by simply pressing the delete button.
![$windows.~bt folder in windows 10 $windows.~bt folder in windows 10](https://lh3.googleusercontent.com/-dHNPhh_VNYg/WMmXjQE8JGI/AAAAAAAABWQ/4OT44UwgBNI/s1600/sghphwrlyhnxuusuokotrnwhsssyyvtr.png)
To delete this folder and recovery valuable storage space. Press Windows Button and Type Disk Cleanup. or press Windows Button + R and type cleanmrg.exe. This will open Disk Cleanup App.
![Disk CleanUp Windows 10 Disk CleanUp Windows 10](https://lh3.googleusercontent.com/-k9wyUtXN5M4/WMmab4thR8I/AAAAAAAABWo/jCGvfuMXFag/s1600/onusokhxjtlxglwjxploywunpjurvjgr.png)
Select the drive you wish to clean and press OK.
![Disk CleanUp Disk CleanUp](https://lh3.googleusercontent.com/-2Sefb_RV1hU/WMmbzNS7stI/AAAAAAAABW0/oQ9AMbwGzO8/s1600/hwhkgwhgtygkyptjvylntxshgvtxrlox.png)
Once it is done "Clean up system files" button. By Default it will not delete windows system files or update files.
![Disk clean up remove systems file Disk clean up remove systems file](https://lh3.googleusercontent.com/-UANHetgpAhg/WMmcZp1hXQI/AAAAAAAABW8/hTuuGbg-Ibc/s1600/ghoupopnlunrlshnwyrrpooynvtugljn.png)
It will again press and calculate the files and size.
![disk clean up selection disk clean up selection](https://lh3.googleusercontent.com/-dYJzDv1zVaM/WMmdYv99YWI/AAAAAAAABXM/nl3XiniJjoU/s1600/stxngsgprnxywuyjpyjkpohygrthwlru.png)
Now check the folders you want to delete and press OK. This remove the $WINDOWS.~BT or any other update folder and reclaim the disk space.