Re: Z420

Hi:

Download and save the drivers from another PC, and copy them onto a usb flash drive and plug the flash drive into your Z420 to install the drivers.

http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?prodNameId=5225035&lang=en&cc=us&taskId=135&prodTypeId=12454&prodSeriesId=5225033

Otherwise you will have to contact HP for the country you live in at the link below and order a set of recovery disks for your PC.

Call the number listed for Business Desktops/Notebooks.

You will need to have the serial number handy to give to the customer services rep.

http://www8.hp.com/us/en/contact-hp/ww-contact-us.html