I'm having this issue and it's driving me nuts! I just purchased the NX430 EPSON all in one printer. It is compatible with my operating system, Mac Lion (10.7.4), which I upgraded to from 10.6 (and 10.5 before that). When I try to install the latest driver I get an error "you must have Admin user privileges to install the software." I am positive I am the admin and there shouldn't be privilege issues. I have researched and found a few suggestions: 1) I have done a repair permissions, 2) a repair disk, 3) I have tried to install using "sudo " in the command prompt, 4) set up a test users with admin writes. Nothing seems to work. I am hoping that someone on this forum has seen this error before and can help me install the drivers to use this printer.