ProBook 450 G @: ADVANCED STARTUP OPTIONS

I have to be able to use a program that doesn't have a digitally signed driver.  I used this software on previous machines without problem.  With the new computer by pressing F8 does not get me in an advanced boot menu where I can choose "disable driver signature enforcement".  I've tried BCDedit patches and they no longer have what I read online.  Anyone know how to get into the advanced boot menu?

I had already tried the F8 button like on previous computers but ony opens a HP screen similar to what you have me sent on Win 8.1.  This interface has no provision for loading unsigned drivers.  I found that after escaping from this interface if I immediately hit the F8 key it would be to raise the black ' advance boot options ' familiar screen.  Thanks for your help.

Tags: Notebooks

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