TP writes two keys to registry, where does this come from?

Hi all,

It seems it's 'portable apps problem week' this week

My TP writes two keys (.... = email adres) to the registry:
-one to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\UnreadMail\.....
-one to HKEY_USERS\\Software\Microsoft\Windows\CurrentVersion\UnreadMail\.....

I can remove them from the registry, but every time I ran TP they're there again.
It's a bit annoying, as I cannot run TP on a PC without leaving 'a trail'

Running TP 2.0.0.23, only addon is Lightning 0.9 for my calender.

Anyone has a clue why this happens, and how to fix it??

rob