PSPad 4.5.7 is update to last full version. I guess you store it in program files folder. You should kow that any program has right to write into Windows or program files folder.
You have 2 ways how to fix it: 1. Run PSPad installer again and uncheck option "Portable application" during setup. 2. Run PSPad as administrator (use right mouse) to elevate PSpad rights, go to Program settings/System and check Multiuser environment -- <http://forum.pspad.com/read.php?2,59221,59224> PSPad freeware editor http://www.pspad.com
