hello... i'm not sure WHY the bug occurs, but I can verify that there is a weird permissions glitch when you install from Windows 7 with a non-administrator account. I think the bug is actually in the Installer/Setup application, and not Bit Che itself. Im pretty sure if you launch the Bit Che installer as a non-administrator, it will install the scripts into the administrator account.
ThermoDust's solution (above) is the correct answer for now.
Also, if you have trouble updating scripts AFTER you do that.. then try this:
1. in Bit Che, go to File, and select "Open App Data Folder.."
2. go into the "Scripts" folder
3. delete all of the ".ini" files. if you dont have the extension visible, then delete all of the "Configuration Settings" files. NOTE: Be careful not to delete any of the other files, including the .exe or .dll files.
4. in Bit Che, go to About, and select "Update Scripts..."
5. Restart Bit Che
Because, it seems that if you copy the files over from an administrator account, then the non-administrator account sometimes can not delete those files.