it's really not a great idea to move the power store files after you have created the store. Power Store really should be installed to it;s final resting place to begin with.
If you have added any images to the content areas or links, the paths will not longer be valid after you move the files.
if you must move them, it's really just a mater of copying the files from one location to another, then editing the content areas that have images or links in them to fix the paths.