If you're buying a computer with Windows installed, then it ought to come with a product key. Just download the appropriate ISO from Microsoft directly, burn it to disc or extract to a flash drive. For the drivers, just go to the manufacturer's website and download the appropriate drivers and burn that to another disc or copy to another flash drive.
Cost $1 for two discs, or $10 for two flash drives < Cost of a new computer
Even better, since you seem to be reformatting quite often, once you have the computer configured how you want, create a clone of the hard drive. That way you don't have to manually do everything over again.
I don't get viruses! If I'm dealing with a virus, it's on some other bugger's machine.
And they probably haven't even created the drivers disk let alone a restore disk. And what sort of idiot downloads an ISO onto a virus riddled machine?
Cost $1 for two discs, or $10 for two flash drives < Cost of a new computer
Even better, since you seem to be reformatting quite often, once you have the computer configured how you want, create a clone of the hard drive. That way you don't have to manually do everything over again.