Network problem between W7 and W7


I have several pc's in a workgroup.
If you browse from a pc with windows 7 to a pc wth xp then there's no problem.
But from a client with W7 to another client with W7 it works sometimes but most of the time it doesn't.
I've already tried the following things:
- Removed "remote differential compression"
- Unchecked IPv6
- disabled autotuning
- changed the LMCompatibilityLevel to 1

Nothing works.
Does anybody has another idea?

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