If you are here, it's likely your shared network folders aren't working. Last week I had to reinstall Windows 10 on my work laptop, and of course I lost my network folders. I worked for four whole days Googling and trying various ways to bring back this functionality. While I can't claim to know what the problem is with your folders, this page finally fixed mine--you have to go on both computers in Group Policy Editor (gpedit.msc, assuming your version of Windows has this function), and "Enable insecure guest logons."
The only reason I was able to find this solution is that (again, after four days) my computer gave me a new error message about unauthenticated guest access. I hope your solution search is quicker than mine. Good luck!