Does ZvBox install proprietary USB drivers that could affect my system?

No. ZvBox takes advantage of the standard USB class drivers that are already in Windows XP and Vista. ZvBox presents as a USB composite device that uses the following three Windows USB class drivers:
1. USB Mass Storage (disk.sys)
2. USB audio (usbaudio.sys)
3. USB CDC (usbser.sys)

All three of these drivers are distributed by Microsoft as part of Windows XP and Vista.