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I could be wrong here, but this is my thought.
When you launch it yourself in XP you are starting it as a program, which carries a slightly higher priority within the Windows system, so whatever is in the background is not interfering with it at this point, even though whatever it is probably is there anyway. When you let windows launch it in SS mode it carries about the lowest priority that there is as far as windows is concerned. So whatever is running in the background at that point can and will steal clock cycles and cause it to run jerky.
I would suggest that you hit Ctl+Alt+Del and go to the task manager and write down everything that is listed there. Then start down the list shutting down everything one at a time and then letting XP start it as a SS and see if it still does the jerky stuff. When it stops doing that, you have found your culprit.
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