Sorry, the key is:
"HKCU\Software\Microsoft\Windows NT\Current Version\Devices"
the String Value Name is '\\BLM\HP_4000M' (ie \\servername\printername)
and the data I wanted to get was 'winspool, Ne00:'

Anyways, figured it out, I had to use the objReg.EnumKey and getStringValue instead of regRead.