First thing I would try would be to uninstall, then reinstall the Balance drivers, reboot and try again. Hopefully that will take care of it.
There is a small but real chance that there may be a hardware fault somewhere. I had difficulty with my soundcard at first which was only fixed when I got a new motherboard (same mfr but different model than the original). It actually took several reinstallations of Windows plus hardware changes. Since then it has been flawless.
Let us know how it goes.
Windows 7 Ultimate x64, Reason 7, BIAB 2013
Intel i5 2500K 3.3 Ghz, Gigabyte ZX77X-UD3H, 16 Gb Corsair DDR3 RAM
OCZ 60 Gb SSD, WD 1 Tb Caviar Black 7,200 RPM HD
Zotac/Nvidia GeForce GTX 560 2 Gb, NZXT H2 "Silent" case w/liquid cooling
Presonus AudioBox USB, Behringer B2031A, JBL PSW D110 sub
Kennesaw (Atlanta), Georgia, USA