Invalid processor microcode update" i have a hp dc 5000 SFF

SOURCE: Missing or invalid processor microcode

Missing or invalid processor microcode update. Please contact HP company for a new microcode update to support the new processor stepping

SOURCE: I've a HP Compaq d530

You have to update the BIOS

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=316715&prodSeriesId=316713&swLang=8&taskId=135&swEnvOID=181

SOURCE: new microcode update sport the new processor

COMPAQ DC7700 SFF Microcode Update
Download the update from the above link. Read the instructions carefully.

Hope it helps! Good Luck!
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