To delete the Windows.old folder from an earlier installation of Windows, follow these steps:
1. Click Start, type disk cleanup in the Start Search text box, and then click Disk Cleanup.
2. In the Disk Cleanup Options dialog box, click Files from all users on this computer.
3. In the User Account Control dialog box, click Continue.
4. Click to select the Previous Windows installation(s) check box, and then click OK.

Advanced users can also use a command prompt to delete files and folders from an earlier installation of Windows Vista. To do this, follow these steps:
1. Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2. In the User Account Control dialog box, click Continue.
3. At the command prompt, type takeown /F <DriveLetter>:\<FolderName>\* /R /A, and then press ENTER.

Note When you run this command, you are granted ownership of the administrator group for the folder, of all the subdirectories in the folder, and of all the files in the folder.
4. At the command prompt, type cacls <DriveLetter>:\<FolderName>\*.* /T /g administrators:F, and then press ENTER.

Note When you run this command, administrators are granted full rights to all files and to all folders.
5. At the command prompt, type rmdir /S /Q <DriveLetter>:\<FolderName>\, and then press ENTER.

Note When you run this command, all subfolders and all files in the specified folder are deleted. Additionally, the specified folder itself is deleted.

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