|When creating a shared folder on a computer you should always use either User accounts, or Group accounts to control access.|
The most likely reason you can't access the share is because your user account hasn't been added to it and given appropriate permissions. If this is a workgroup scenario then you'll have to go on the target PC, create a user account on it for yourself using the exact same credentials (username/password) you use to logon to the computer you're connecting from. Once created, add it to the share and grant that account appropriate permissions.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.