Hello Mike;
I believe your problem lies with the Sample Rate of Traktor and your Soundcard;
Traktor will only allow you to have a Sample Rate of 44,100;
However it is Possible that your PC/Laptop Soundcard is set to 48,000 – and this will cause your Tracks to play Too Fast;
To solve this;
Right Click your Speaker Icon next to your Clock on the Taskbar;
Choose Playback Devices; then Recording; then Realtek High Definition (or whatever your Souncard is); then Properties; then click the Advanced Tab; and either Reset To Default; or make sure that the Sample Rate is 44,100;
If this doesn’t work; come back and we will find another solution 🙂