wanted to try out the unofficial MXE build on my Win7 PC. I prefer the portable / unzipping approach, so I downloaded octave-3.8.1-1-portable.zip. While unzipping to C:/Octave, I got an Access Denied pop up. It thought it needed admin to copy
C:\Octave\octave-3.8.1\share\nsis\Contrib\UIs\default.exe
enabling Admin, it then gave a general Access Denied error. Nothing I tried would let it pull the default.exe file out of the archive. I downloaded the .7z version, and got the same problem. 7za wouldn't extract the default.exe file. (all else was fine).
Just for kicks I created an empty text file there, renamed it to default.exe. PC was then fighting any attempt I made to modify and delete that file. Admin delete killed it, but windows even threw an access denied error that time.