A new tutorial titled How to remove the Windows.old and $Windows.~BT folders after you upgrade Windows was added by Lawrence Abrams. Please use this topic to discuss any aspect of this tutorial.
A brief excerpt of the tutorial can be found here:
When you upgrade your current version of Windows to a newer version, the upgrade process will create backups of important directories from your previous version of Windows. These directories include your user profiles, Windows folder, Program Files directory, and other important locations. These backups are then stored in two folders called Windows.old and $Windows.~BT, which can be used after the upgrade to recover any data that may not have been properly migrated over to the new version of Windows. These two folders, though, can use up a significant amount of hard drive space on your computer. Therefore, if you are sure you no longer need any of the files in those folders and all of your data and apps have been migrated successfully, it is a good idea to remove these two folders to reclaim that space for other programs to use.
We hope you find this tutorial helpful.
The Bleeping Computer Staff