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How can it be changed; cannot spot that option in the U.I.?
Thanks
As far as I know Powerdirector's cache file location can not be changed. PD uses the User area in Windows 7 or the Windows Temp files location.
There have been attempts to move the Windows OS page file and User Area file, but not much success.
Here is a link to that attempt. I do not recommend doing this.
How to move paging file to another physical hdd in Win7
http://www.sevenforums.com/performance-maintenance/53542-how-move-paging-file-another-physical-hdd-win7.html