Reply to Either laptop or soundcard?

Hi all!

Recently I bought a VCI 100 midi controler and am having problems with playing. The thing is, whenever I play a track it gets periodicly interrupted. I tried changing latency in both traktor and in software of my soundcard but it`s no use. I`m using an Acer aspire laptop: AMD Turion 1.6GHz,1GB DDR2, ATI Radeon X1600 128MB, 120GB HDD and a Presonus firebox SC. Any help please? I`m desperate