I have the same issue
my vrpathreg is
E:\Steam\steamapps\common\SteamVR\bin\win64>vrpathreg.exe
Runtime path = E:\Steam\steamapps\common\SteamVR\
Config path = E:\Steam\config
Log path = E:\Steam\logs
External Drivers:
G:\Driver4VR\lib\drivers\driver4vr
if I delete openvrpaths.vrpath in the appdata folder it uninstalls Driver4vr register but steam vr will launch again
When I try to launch both I get Error (301) in steamvr and it will not launch steam vr