Thank you...
Under System Properties>Avanced tab>Performance Settings>Advanced tab>Virtual Memory>Change the page file is set to "automaticaly manage page file size across all drives". It is currently set at Min 16MB, max 12586MB, although when checking this I note that recommended is currently 18429MB. I have 12GB RAM installed. If I deselect "automaticaly manage page file size across all drives" the E:/ volume has a paging file size of None and is set to 'no paging file'.
I'll try TreeSize