First of all, make sure you are not connecting Balance through a USB hub, it has to be connected directly to your PC. Also try moving the Balance unit to another USB port. Sometimes some of the ports are connected through a hub internally. If you connected it through a USB port on the front, try the ports on the back and vice versa. (This also goes for left/right on a laptop.)
Download and run the DPC latency checker from Thesycon (http://www.thesycon.de/eng/latency_check.shtml). Run it without Balance connected, and make sure you have a constant low latency without any spikes in the graph.
If the latency checker says there are problems, try disabling different drivers / devices in your system until you find the culprit. As an example, on some Windows machines, the wireless LAN interface causes problems with all audio interfaces resulting in choppy sound. Disable devices using the Windows device manager. Things to disable first are: Other audio interfaces, wireless networking, wired networking, other USB devices.
You should also try updating drivers for the chipset and your graphics card.
If this doesn’t help, please get in touch with Product Support for further trouble shooting, and include the model of your CPU, your motherboard and your chipset.