I seldom use utorrent, but the last two times I did, it created a registry entry. In addition, on a restart of the machine (Win 7 Pro) I get a dialog box asking if it's ok for utorrent to make changes to my machine. (I say no.)
In msconfig>startup I see and disable the utorrent item. When I did so the second time, it was also showing the previous item (disabled). Prior to posting this, I went back into msconfig and see only the most recent one listed.
The key's command is d:\portableapps\portableapps\utorrentportable\app\utorrent\utorrent.exe and the registry key is HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run.
D: is a hard drive partition on which I have "installed" portable apps.
This does not strike me as being portable behavior.
Do the other torrent apps in portableapps behave better? (qBittorent or Transmission Portable).