Hi David,
so the issue seems to be related to UAC and that sort of Win7 stuff.
What I did was remove the PGPprefs.xml from the PGP Homedir, and try a new licensing. This also didn't work (PGPprefs.xml didn't reappear).
I then did a search for PGPprefs.xml on the C:-drive, which showed me some PGPprefs.xml files in the C:\Users directory structure, in subfolders named VirtualStore. It appears that the system stores files there that it can't store due to missing administrator rights (even though I had already put explicit admin rights for the user on the system).
Next I relicensed the product using a command prompt where I explicitely took Administrator rights (right-click, run as Administrator) > PGPprefs.xml appears in the PGP Homedir.
Lastly, we needed to add 'run with Highest Priviliges' in the properties of the Scheuled task.
I hope this is clear for you?
Anyway, thanks for your assitance in this, and I hope our thread can help some other users with similar issues.
Kind regards,
Laurens.