Windows 7 Clean Install

Please don't write it this way. Windows 7 is an OS.
ios/iOS refers to the Apple operating system. (Usually something with a small i in the front is Apple like iTunes, iphone, iPad, iMac).

If you say Windows 7 ios people might think you are dual booting Windows and an Apple operating system.

and no ios and ISO are not related. An ISO is an image file of almost anything that you "burn" to a disk or a USB stick so it is usable.

 

Two options come immediately to mind -
A. Use another PC to create a password reset disc
B. Use another PC to download a Win 7 .iso and create a bootable install thumb drive

 

Turn the laptop over and check the version of Windows 7 and the serial number.
Once you have those two critical bits of needed information, download this tool onto a working computer http://www.majorgeeks.com/files/details/microsoft_windows_iso_download_tool.html
This allows you to download an ISO for any version of Windows 7. Make sure you select the correct version and bittedness.

It is useless if you don't have a serial number because it will not install.

 

https://answers.microsoft.com/en-us...key/1ef61a91-99f9-442a-af16-31a8bb8ba3b4?db=5

The problem with OEM computers, is that the key reported for the install doesn't match the serial number on the bottom/back/side of the unit.
Using the key retrieved from the "mass" install on all computers might not work for a clean install.
That's why I generally write down the key on the unit when it is new and before the label fades.