How do I remove the Windows.old folder ?

Open Disk Cleanup by clicking the Start button . In the search box, type Disk Cleanup, and then, in the list of results, click Disk Cleanup.

If you’re prompted to choose a drive, click the drive you just installed Windows on, and then click OK.

In the Disk Cleanup dialog box, on the Disk Cleanup tab, click Clean up system files.

If you’re again prompted to choose a drive, click the drive you just installed Windows on, and then click OK.

Select the Previous Windows installation(s) check box, and any other check boxes for the files you want to delete, and then click OK.
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