Ever since I went to Windows 7 from XP, I have been unable to access Mac Mini (running Mountain Lion) from PC. I give up for months at a time, then try again. This time I got as far as being able to see my shared files on Mac but when I try to open them and enter requested user name and password, I get "Access denied" message. I have tried suggestion found elsewhere to log in as Guest with no password and that doesn't work either though it seems to work for other people. Under 'Sharing' on Mac I have enabled 'Read and write' for all users, including 'Everyone' and my PC, which is listed there as user. The only one I haven't enabled 'Read and write' for is 'Public'. My workaround is to use Teamviewer, a free utility that allows me full access to my Mac including running apps and transferring files, but does so on a reduced screen that is uncomfortable to look at. So an additional question is, how come Teamviewer can get to my Mac files but I can't?