these are things I did to make my BD390 and BD570 work with CIFS shares on Windows 7, 8 and server 2012.
Control Panel -> Administrative Tools -> Local Security Policy... From the list along the left, expand Local Policies, then select Security Options. In the Right pane, scroll down to "Network Security: LAN Manager authentication level" and set it to Send LM & NTLM - Use NTLMv2 session security if negotiated
Next was follow tip from ->
http://www.avsforum.com/t/1124111/b...layer-master-owners-thread/6360#post_19995263 and created a user for the BD players on my "server" as User: LGE_BDP with Password: LGE_BDP and granted it rights to my share. (the other user suggested, ROOT with no password, didn't work) <== this one was VERY IMPORTANT (since password is case sensitive, try using lower case also, I forgot which way I did it)
The only other thing I did was disable autotuning ... see ->
http://www.speedguide.net/faq_in_q.php?qid=247 (works in Win7, Win 8 and Server 2012)