nope, it's still a full copy of windows xp running. same issues different day.
The only part that might help is if you run vpc in nat'd mode, with os x becoming a router for xp.
Otherwise, though, if you were to run a virus, trojan, or other malware, you'd be at the same point.
The question is, what do you need xp for. If it's one specific app, than it should be (reasonably) safe.