Reply to VCI-400 serious CPU overload problems in Traktor/Serato

Hi there,
I have had my 400 for around a month now & it works great on my desktop running windows xp & Traktor Pro 2.5. (have tried 2.6 also)
The problems occur on my laptop. CPU overloading continually, 100% cpu in both Traktor & Serato intro. The unit is totally unusable on my laptop.
Laptop specs- Core2Duo 2.4 cpu, 3gig RAM etc. I was running vista but I updated to windows 7 today as I thought that might sort it....but it's just as bad if not worse!
The laptop is a Dell Vostro 1500.
If anyone can help me work this I'd really appreciate it. Guessing it's some compatibility issue?
Regards
Dan