I searched through everthing I could think of on my XP Pro box, and could not find any reference either.
I even searched the registry.
My best guess is that it is part of a device driver, or an application program.
If it were my machine, I would search the registry using regedit from the run box.
DO NOT EDIT THE REGISTRY WITHOUT BEING SURE WHAT YOU ARE DOING. YOU CAN DISABLE THE COMPUTER!
Before running regedit, it would be a good idea to create a "Restore Point". Check the XP help menu for details.
First, look for where the key that contains the words "virtual truck" is. That will help narrow down what is going on.
If it is just a file reference, and is not directly associated with a device driver or program, it may be safe to delete the key.
I would need to know which key and sub-keys the reference was in before I could give specific recomendations.
Another option would be to use a system utility such as Norton Win-Doctor, or OnTrack Fix-It to search out and repair the problem.