If you performed
repair install,
upgrade install, or a
custom install without formatting the drive for a
clean install and selected to install Windows 7 on the same partition of the previous Windows installation, then you may have a
C:\Windows.old folder left over in your new installation.
If you already had a
C:\Windows.old folder in the installation that you performed a repair install, upgrade install, or a custom install on, then it would be renamed to say
C:\Windows.old.000 (older previous installation) in addition to the
C:\Windows.old folder. The most recent previous installation will always be in the
C:\Windows.old folder.
This will show you how to delete the
Windows.old folder(s) generated during the installation to free up the hard drive space that the
Windows.old folder(s) takes.