Reply to Few Question about NI Traktor software

Hi mates,
I have a question about traktor software, I have Hp ProBook 4520s (2.16x4, 4gb of rams) and bcd3000, hp runs windows 7 64 bit platform and when I play with bcd on traktor sometimes even often it gets lags, so i was wondering that the prblem comes from bcd and it can't work with traktor pro 2? or the main problem is the 64bit windows platform? because on 32bit it haven't got lagged as much as now on 64 bit
I'm planing to buy the S2, so don't wanna have same problems with it.
Thanks for your attention and sorry for bad english
Peace
(V)