I recently installed the Pinnacle Studio version 11 upgrade and found this while while going through the ReadMe file:

7. Windows XP: Switching User During Capture.
Never do this. Very bad things will happen.

Sometimes though I think that being a little too succinct with warning messages can have just the opposite effect of the one intended.  When I saw that I immediately thought...  Maybe I should give it a try just to see what happens.  To me, this warning is about the equivalent of you mom telling you not to do something and when pressed for a reason says "Because I said so that's why!"  That answer just made me all the more determined to do whatever it was I had been told not to do.

Even now, as I sit here, my mind is wandering through all the possibilities of how bad could it truly be.  Maybe I could try this in a VM.. just in case?  Is it so bad that even a VM couldn't protect me?  Would it be one of those spectacular crashes resulting in a blue screen and an unbootable system...  or would it be one of those really subtle bugs that slowly saps the energy from your system until it runs extremely slow (in other words would it make my XP system run like Windows Vista).