This could be because of UAC. Please disable UAC in control panel and try again.
As a side note, I would suggest to not store/save any templates or library files on OS installed drive, for e.g. C drive. Better keep them on D drive or different location if possible. In case you don't have partition on system then don't save them on the default location but rather keep them out of that. And also if you've multiple versions installed, then seeprate folder for each. This way they would be protected in case of any deleting or uninstallation of the tool and also won't get mixed up.. For e.g. C:\SOLIDWORKS 2015 Templates