Are you sure you didn't installed PSpad as portable into program files? Any program has no possibility to write into program files folder.
If your PSpad is in Program sfiles folder, start PSpad as admin, open program settings / System integration, check multiuser environment and save settings. Close and start PSPad standard way. -- <http://forum.pspad.com/read.php?6,66774,66814> PSPad freeware editor http://www.pspad.com
