Unable to install OS X Mavericks on MacPro

Getting error message "OS X Mavericks cannot be installed on this computer" Learn More and Ok are the only options that I have.
Currently I'm running:
Any help from the Community would be huge.
Thanks!
Matty

So if I have DDR2 Ram, there is no possibility of upgrading to Mavericks?
I installed mavericks onto an external hard drive (using a backup of my early
2011 mac book pro), tried to boot it with my early 2008 macbook and
this is what the screen looks like. Hoping to install Mavericks on my early 2008 macbook too.
Any advice would be appreciated

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Path: /Volumes/VOLUME/HP Installer.app/Contents/MacOS/HP Installer
Identifier: com.hp.Installer
Version: 3.3.0 (2)
Code Type: X86 (Native)
Parent Process: launchd [137]
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Report Version: 11
Anonymous UUID: 941C7BE8-E4F1-51DD-FEBF-9B465619D6DF
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Hi @jfdevinejr,
Welcome to the HP Forums!
I understand that you are unable to install the HP Officejet pro 8600 software on Mac OS X 10.9.4. I am happy to help with this installation issue!
Please visit this website, HP Officejet Pro 8600 series Full Feature Software and Driver- OS X 10.9 Mavericks. Scroll down the page, and I would like you to hold down the control button, and click on the .dmg file, then save it to your desktop. Wait until it is fully downloaded, and then try the install again.
Hope this helps, and have a good day!
RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

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Hi
I have a MacBook Pro
During use my screen froze and I had to force quit. Since then I have tried the following:
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Unable to install OS X Mavericks on MacPro

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