Try this...
1. Enable "File sharing" on the Device you want to share. You will be given a choice on accepting this protocol or not. It will be under "Nearby Devices" setting.
FP-SSD and FTP, you will need these in order for Windows and sharing to see your device(s). They will automatically be installed. You can also delete them, but you will need it to link with the computer. Windows uses FP-SSD for file transfer.
2. Install onto your tablet, and run, "ES File Explorer File Manager", from the Google Play store.
3. In the top left hand corner of the program you should see "Local LAN FTP Bluetooth". You are going to want to select LAN (Local Area Network).
4. Once you have selected LAN, there should be a "Plus sign" at the top of the menu bar. This is for adding different Servers. Then you will want to select the "Scan for Server" option. You can also manually set your up your info, or even set it to log in via "Anonynomous". However, scanning it is much easier.
5. Now once you have used the "Scan for Server" you should be able to see your IP address. If you have password protected your system, meaning Windows, you will need to log in. It will ask you for the password for the computer/system, not the Internet router password.
6. Once you have input the Computer name and password you should be granted access to the Homegroup.
NOTE: You will usually not see your device listed as in the Homegroup. You should only see it in "Added Devices" for File Sharing.
IMPORTANT NOTE: If you do not have any kind of Anti Virus programs I would also suggest you add it to both the computer and the tablet. Why? Well because you are in "Fileshare Mode" and need as much protection as possible.