This hopefully helps if anybody has the same problem than me.
The problem was, that I could not use my original MKII under WIN7 64
bit.
The firmware upgrade worked, but for flashing I always got this
errormessages
Unable to connect to tool AVRISP mkII
Timestamp: 2012-01-03 23:10:27.138
Severity: ERROR
ComponentId: 20000
StatusCode: 0
Unable to connect to tool context: 'Atmel.VsIde.AvrStudio.Services.TargetService.TCF.Internal.Services.Remote.ToolProxy+ToolContext'.
Failed to get interface clock value
Timestamp: 2012-01-03 23:12:00.376
Severity: ERROR
ComponentId: 20000
StatusCode: 0
Unable to connect to tool context: 'Atmel.VsIde.AvrStudio.Services.TargetService.TCF.Internal.Services.Remote.ToolProxy+ToolContext'.
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I used AVR Studio 5.0.1163 (update check mentioned no updates availible)
Therefore I contacted the Atmel support and they proposed following
solution
We recommend to install the latest version of AVR Studio5.1 available in the link below which has updated solutions for known issues and tools compatibility issues.
http://www.atmel.com/dyn/products/tools_card.asp?category_id=163&family_id=607&subfamily_id=1965&tool_id=17433
Note that the AVR Studio 5.1 BETA can co-exist with your 5.0 installation.
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With this BETA version everything works fine now (at least for me ;-)