How to download Windows 7 ISO file with key from pre-installed Windows?

[DeadHarddrive]

My hard drive is dying. I'm going to get a new one and i need to install Windows on it. My computer was prebuilt with Windows 7 preinstalled, so i have no disk. I do have the key for my version of Windows though, they were kind enough to put the key on a sticker on the side of the case for me. But when i go to Microsoft's site to download the ISO, and enter my key, i get this message.

"Error

The product key you entered appears to be for software pre-installed by the device manufacturer. Please contact the device manufacturer for software recovery options."

What do i need to do to get my Windows 7 ISO fie?

This is my first time commenting on this site, and i don't know much about computer hardware. I just really don't want to have to buy Windows. I mean why would they give me my key if i cant use it again on a new HD?

 

[glamdringfh]

Edit:

Most pre-built PC's come with a system recovery disk that includes the Windows 7 installer. I would look for that first.

 

[R4lNM4N]

Get your ISO from microsoft here ...http://www.microsoft.com/en-us/software-download

Use one of the following tools to create a bootable USB of the ISO...

http://www.isotousb.com/ <---I like this one
https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool <---This one is from Microsoft specifically designed for this

 

[bignastyid]

Get your ISO from microsoft here ...http://www.microsoft.com/en-us/software-download

Use one of the following tools to create a bootable USB of the ISO...

http://www.isotousb.com/ <---I like this one
https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool <---This one is from Microsoft specifically designed for this

The Microsoft link only works for retail keys and the OP's is OEM.

 

[bignastyid]

Microsoft killed the digital river downloads for OEM products so there is no legit downloads for OEM copies of 7 anymore. If you didn't create the system recovery discs when you got the system then you'll need to borrow an OEM 7 disc(of the version you have), buy one, or buy the recover discs from the manufacture.