Hi:
You should be able to use most of the W7 drivers from the Probook 450 G0 on your model, except the audio.
Your model uses the Intel HD graphics driver.
DO NOT USE ANY BIOS OR FIRMWARE DOWNLOADS FROM THIS LINK
http://h20565.www2.hp.com/portal/site/hpsc/public/psi/swdHome/?lang=en&cc=us&sp4ts.oid=5359407
Audio: Accept the agreement, download and install the first or second driver on the list depending on if you installed W7 32 or 64 bit.