Cannot access Shares on windows network

Hi

I am new to this forum and apologise if this post is in the wrong section but it seems the closest to the problem I am encountering
I have a Ready NAs Duo that is connected to a windows network but can no longer be accessed from my PC . It can be seen as a storage device on the network but clicking on this just takes me to Frontview.
Clicking on the NAS name in My computer gives an error message ' Windows cannot access \\NAS-CE-8B-51. Check spelling of the name....'
Although Raidar will locate the device, clicking on 'browse' tab will give the same error message after about 2o secs i.e windows cannot access ...
I am running Win 7 Pro
Radiator 4.1.14
I can access my files after enabling HTTP protocol but this isn't ideal
In network settings I am using values from a DHCP server
I am on the same workgroup
CIFS enabled
AFP and NFS currently disabled although they have been enabled in the past allowing access from Mac

I have tried rebooting NAs
Disabling and enabling CIFS

I am not particularly tech savvy and would really appreciate any help/pointers to get my access back

Thanks