I can't install Lion because Macintosh HD can not use it as a startvolume. please help!

I can't install Lion because Macintosh HD can not use it as a startvolume. please help!
greetings from Austria ;D

http://www.apple.com/support/lion/installrecovery/
And this link for How to create Lion Recovery Drive just went MIA / "404"
http://support.apple.com/kb/HT4713
http://support.apple.com/kb/HT4718
You can also use the OS X Lion installer from the Mac App Store to create an external bootable drive, complete with a Recovery HD partition. See this article for more details. This approach will, at least, create a bootable drive with Recovery HD which you can carry with you in case you need to use Internet Restore or make use of the other utilities Recovery HD provides.
http://support.apple.com/kb/HT4649

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