New client machines cannot join domain following compromise

Had a standalone domain controller which became compromised.

Have taken back control and cleaned it up, killing off lots of unauthorised applications and services.
However, I've since been unable to join new machines to the domain.

The error is 'The network path was not found'.

I've looked at DNS in close detail on the AD machine... I've removed and rebuilt many entries there... i'm fairly confident DNS isnt at fault.

I did notice that if I browse, on the DC, to \\127.0.0.1\ I get a few shares... (netlogon and sysvol), however if i browse from another machine to 192.168.3.251 (DC network IP) I do not get any access at all to those shares.

Any suggestions will be greatly appriciated!