If you do not want to go the account route, you can just add "Everyone" to the security and network options. As Alikum said, you will beed to turn off passord file sharing from within network and sharing center.
First click start and in start search type "network and sharing".
You should then see Network and Sharing Center.
On the left side there is an option called "change advanced sharing settings", Click that.
scroll down until you see "Turn off password protected sharing". Select that radio button
With that done you are ready to set your sharing preferences and security settings.
With basic file sharing on, that may be all you need to get it to work. If you use advanced, add Everyone to the security tab under folder properties. I recommend making a folder instead of sharing the drive it self.
If you need to set the security options(you will know this if you can not access or write to the network drive.)
Right click the folder you wish to share and select properties. select the security tab(this sets the NTFS[file system] security) then follow the image.
1. Click Advanced
2. Click Add. This is how you will add Everyone
3. Type Everyone(or even ever and hit check names it will fill the rest in for you)
4. Hit Ok
5. With Everyone selected add a checkmark(under Allow) to Modify and Write. There others should have already had checkmarks.
Since you already said you know your way around the actual share settings, i will leave it at this.
Post back if you get stuck.