Connecting to a Mac Running OS X Yosemite (10.10) from Windows 7

I don't know why I have to struggle with this every time my Mac or Windows OS gets upgraded. It's stupid that it's so hard. I have to do this so infrequently that I forget the little tricks. So, for posterity, here's what I had to do this time.

1. Change the encryption options in Win7 via the Group Policy Editor (note: requires Professional or higher variant of Win7—must directly hack the Registry in lower variants that don't have the Group Policy Editor):
1. Go to Start, type secpol.msc and press Enter to get editor up.
2. Locate "Network Security: LAN Manager Authentication Level" in the list and double-click on it.
3. Change the setting from " NTMLv2 response only" to "Send LM & NTLM - use NTLMv2 session if negotiated".
4. Network Security: Minimum session security for NTLM SSP Based (including secure RPC) Clients.
5. Change the setting from "require 128 bit" to "unchecked (No Minimum)".
6. Click OK.
2. On the Mac, make sure the "Allow guests to connect to shared folders" option is selected in the Accounts Preferences pane.
3. On the Mac, in the Sharing Preferences pane, make sure the "File Sharing" service is selected. Then click "Options" and make sure "Share files and folders using SMB" is selected. Note that user account sharing should be off.
4. While still in the Sharing Preferences pane, make sure my shared folder is still defined. Close the Preferences pane.
5. On the Win7 computer, right click "Computer" and select "Map network drive." Pick a drive letter.
6. In the "Folder" field, type "\\" followed by the IP address of the Mac, followed by "\" and the name of the shared folder. Make sure "Reconnect at logon" and "Connect using different credentials" are selected. Click "Finish."
7. When prompted for the network password, select the "Use another account" option. The user name should be "\guest" and the password should be blank.