Remove $WINDOWS.~BT

RemoveBT.cmd

// go inside that folder:
cd /d "C:\$Windows.~BT"

// take over ownership
takeown /f *.* /R /D Y

// (go for coffee, takes a minute)
// grant full rights to everyone
icacls *.* /grant Everyone:(OI)(CI)F /T

// (coffee?)
// and all other subfolders, just be careful with use of *, naturally.
rmdir Sources /s /q

// actually, I got a few errors with rmdir. Things went smoother 
// with this Unix-like ´rm´ executable in your path,
// coming from unxutils.sf.net
rm -r -f *

// after all has been wiped, also remove the parent dir

C:\$Windows.~BT>cd ..
C:\>rmdir "$Windows.~BT"

// checking...
C:\>dir /A:DHS