Windows 7 fails when authenticating to another computer on the network

In Windows 7 (home premium, 64 bit), I am attached to a VPN (Using OpenVPN). Then, whenever I try to either:
- Use explorer to look at the file system of another computer
- Use the remote desktop connection on another computer
- Map a folder on another computer as a network drive
... in all of these cases, I get the authentication dialog and once I send my username and password, it crashes. For example, when I use explorer, it hangs, and then comes back with the message: "Explorer has stopped working"
I have elsewhere seen a proposed solution for similar symptoms, of deleting this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SQMClient\Windows\DisabledSessions\MachineThrottling
However, this is not applicable in my case, as the key is not present.
I don't think that this can be a problem with the network, because:
a) this works fine from a different computer, running XP,
b) I have in fact seen this working on this computer, but just once, straight after a system restore, and I can't replicate the success by doing another system restore.
c) If it were a problem with the network, you would expect Windows to fail gracefully.
Additionally:
- Disabling the firewall doesn't help.
- Disabling the antivirus software (AVG) doesn't help.
- Doing a clean boot doesn't help.
I'd be grateful for any suggestions.

try changing windows authentication levels
http://social.technet.microsoft.com/Forums/windows/en-US/aca3e2d0-6d43-431f-bbba-3c01aea6d5a6/changing-authentication-level?forum=w7itpronetworking
http://technet.microsoft.com/en-us/library/jj852207.aspx

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Robert Pearman SBS MVP
itauthority.co.uk |
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Message was edited by: donv (The Ghost)
Message was edited by: donv (The Ghost)

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