Can't install Mavericks on my HD

Today I got a message I can download Mavericks on the App Store for free and install it, upgrading from OS X 10.7.5. I did so but then got the message that I can't install Mavericks on my HD, for the exact message see the attachment. Beofre it told me that I am using ths volume for TimeMachine backups, which I don't.

Maybe of impoartnce: When I bought my MacBook I had the original HD exchanged with an SSD HD, might that play a role?

Thanky for any hints!
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strungConnect With a Mentor Commented:
Try the solution in this Apple KB
There is no attachment.
thuna72Author Commented:
You are right...
thuna72Author Commented:
worked like a charm. THANK YOU.
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