We apologize profusely for the massive delay.
This is one of the easiest errors to fix. It simply means you don't have credentialed access and you just need to know the username and password to scan. It also means that if you tried visiting that PC from Windows Explorer (bypassing NEWT Pro completely), it would ask you for a username and password. If you know the username/password, try entering it in Windows. If you get access, then try accessing \\DESK4\ADMIN$ through Windows Explorer. If you can get to that folder, right-click on that DESK4 in NEWT Pro, choose Set Credentials, then enter the same username and password you used in Windows Explorer to get ADMIN$ access.
If you don't know the username/password, you won't be able to deep scan that PC remotely using any software in the world. If that's the case, the only option would be to install NEWT Pro on DESK4 locally and then choose "Scan My PC".
Alternatively, if you're only needing some basic info such as full OS type, PC name, uptime, brand and others, you could use Slitheris Network Discovery, which can detect this info with no credentials or authorization needed whatsoever.
Please let us know if you have any other questions and we'll make sure to reply much more quickly.