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Unable to install Win 7 on Z420

HP Recommended
Microsoft Windows 7 (64-bit)

Hi, have a Z420 with broken HDD that I received from my job. Has mounted an empty HD 500GB. Trying to download Win 7 (64) but getting BOOTMGR missing. Does the missing file or how do I. Grateful for help. Have attempted to load programs on USB memory but get the same resume. Have previously installed OS on other computers without any problems. I have the serial number on Win 7 that was previously installed. However, it is not possible to retrieve when my computer was previously purchased by my employer.

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HP Recommended

Are you downloading Windows 7 via:

Does your computer have the "Microsoft decal" on the case, showing either "Windows 7 Home" or "Windows 7 Professional", and showing the 25-character product-key?


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