So your existing sources are still working but your issue is only with adding new ones? If that is the case then there is no reason to modify your advancedsettings.xml like that. I would suggest to go to
Settings > Media > Videos > Add videos > Browse > Add Network Location >
And then make sure the protocol is set to SMB and in the “Server Name” field click on it and manually type in “LACROSSE” or preferably, the ip address of your Server, and then click OK. Don’t type in any characters other than just the computer name or ip address. Now instead of going to Browse > Windows network (SMB) you will go to Browse > LACROSSE (or the ip address if that is what you used) and you should be able to see and browse the shares on your PC.