HP EliteBook drivers not digitally signed

Hi,
Big problem here - I have upgraded a new HP Elitebook 840G1 from Win8.1 to our companies Enterprise Win7 x64 image.
When trying to install some of the drivers from the Official HP Support page for this model I am getting Programme Compatibilty errors saying the drivers are not digitally signed and I should uninstall them.
In particular I recieved this error after installing HP 3D driveguard. I uninstalled the program but it appears to have left the disc driver behind as when the laptop is now booted up it goes into system recovery mode. The only way I can get it to boot is to F8 and select to disable driver signature enforcement... NIce one HP!!
The IDT PC audio driver also throws up an error saying it is not digitally signed although the PCI REaltek media driver did go in OK.
Anyone with any ideas of how to fix the broken 3D drivegaurd issue??
I cant beleive that HP are offering up drivers that are not properly digitally signed....

If that unit doesn't come with 8.1 support asking for help on unsupported O/S will not get forum user help here. Want User forum help here you need to go back to the supported O/S then others can help you. You don't install unsupported O/S and expect to get support.....HP will also tell you that as well.
I am a Volunteer to help others on here-not a HP employee.
Replies aren't online 24/7 because of Time Zone differences.
Remember in this Day and Age of Computing the Internet is Knowledge at your fingertips if you choose understand it. -2015-

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