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Homegroups - "windows cannot access" 0x80070035
There are three W7 64 bit machines on our homegroup. Two work fine together and both of them can access the material on the problem 3rd machine as well as each other. However the third machine cannot access the material on either of the other two even though their icons and folders show under "Homegroup" on the problem 3rd machine. I have followed instructions Ultimate Troubleshooting Guide for Windows 7 HomeGroup Connection Issues and elsewhere on both the problem 3rd machine and one of the other two. No change. I have tried with the problem machine hard wired to the network and connected via wi-fi. Makes no difference. Clicking, in Homegroup on the 3rd machine on a shared folder on either of the other two machines gets the message "Windows cannot access", code as above, it also says "Network Path Not Found" and then offers a diagnosis routine which fails to identify the problem and then has you going round in circles.
The problem machine is running Home Premium as is one of the OK machines, the other is running Ultimate. All three are running AVG Internet Security 2012 which I have also disabled on the problem and ok machines separately and simultaneoulsy - it made no difference.
I am now stumped, having wasted half a day trying to figure it out. Any help appreciated.