I have had a couple of suppport calls on this recently so here is the shake down for a Windows 7 install. Similar problems are encountered in Win 8 too. There are 2 things to do for your install to work properly.
1. Before you install TheoLt. For the Authorisation to work you will need to set the UAC to ‘never notify’ The setting is in Control Panel, User accounts, Change User Account Control Settings:
2. The working path for TheoLt is set by default as c:\. Many Windows 7 installs lock out read/write actions to this path. You need to re-set the path away from the root. If this is not rectified the scripts for TheoLt orientation will fail:
The latest published version(8.22) of TheoLt is here