Network Error

I have a problem with network sharing when I want to go to folders of shared computer
I got error 'Windows cannot access \\computer_name'
"Check the spelling of the name.Otherwise there might be problem with your network.To try to identify and resolve network problems click diagnose."
error code: 0x80070035
I tried solve it with creating homegroup but nothing.
How do I fix this?
Please if you know the answer tell me how to do it step by step.

windows 7 ultmiate 64bit
windows firewall windows defender eset smart security firewall