Hmmmm... I would suspect (being the naturally suspicious guy that I am) that somehow, he's installed some tracking software on her system. I don't have an idea of specifics, but there are things you can get which can record what happens in a computer session. Some are hardware based, and some are software based.
I'd check the physical PC itself first to make sure there are no components that don't belong (one critter plugs into the keyboard cord, IIRC).
Then I'd check the PC for all background processes and things in the task manager, and get rid of everything I don't know, recognize, or accept.
At a final step, I'd look at reinstalling Windows if you're really concerned. DO a clean install from a format and you can be more certain of what's on there. I'd also enable security (i.e. no file sharing, shared directories, etc.).
Good luck.
*B*
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