Hi,
Where did you get the driver ? Have you tried:
For G510: http://ftp.hp.com/pub/softlib/software11/COL32500/mp-80498-1/OJ4500vG510a-f_Full_13_en.exe
For G510n-z: http://ftp.hp.com/pub/softlib/software11/COL32439/mp-80348-1/OJ4500vG510n-z_Full_13_en.exe
Regards.