Microcode Update error ?

You need to update your bios. and to do so please go to link below and download bios update. and run it. and dont try to shutdown or reboot your system while updating the bios.
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=316715&prodTypeId=12454&prodSeriesId=316713&swLang=13&taskId=135&swEnvOID=1093#120

Do One thing Just download the BIOS Update for your pc Model and update the BIOS.
Note: The bios update can damage motherboard also. Get exact update and then try.
Please do not shut down or power off you pc when the update is running otherwise you will loss your board.

1801 Microcode Update Error?

HP Compaq d530 SFF PC Desktop gives this error code.

My computer when started then show 1801microcode update error and press f1 then continue windows 7style.

Simply run "micro code update patch" which is provided my hp itself.You will get this update from hp website.

The manufacturers website should have a bios update that will fix this, this usually happens if you change the board or processor.

Download the SoftPaq .EXE file to a directory on your hard drive.
Execute the downloaded file and follow the on-screen
instructions to build a bootable diskette that can be used to update
the supported systems.
Restart the computer, allowing it to boot from the created
diskette. Follow the on-screen instructions to update the processor
microcode.