So if you enter the key here:
https://www.microsoft.com/en-us/software-download/windows7
No bueno?
Home Premium should come up for you with the key and give you the option to download the MS ISO direct. But I have seen occurrences where that isn't the case. Just wanted to confirm.
Yeah MS tells me to go to ASUS lol.
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.
ASUS say
Thank you for contacting ASUS Product Support, my name is Brandon C.
I hope you are having a wonderful day today.
I understand that you are in need for a recovery media to restore the OS on your unit. I will do my best to assist you with regards to this query.
I apologize for any inconvenience that this may cause but based on checks made there is no Recovery Media for your device specified.
We do
value your business, thank you for being a part of the ASUS family.
If you have any further questions, comments, or concerns please do not hesitate to let us know, we will be more than happy to assist you.
Best Regards,
Ya gotta be careful of that F word, i would not go as far as value.