All laptops contain something which some people consider bloatware, because it is difficult to draw the line.

For instance, is it "only the OS installed" if it includes hardware-specific support for the display adapter, or a fingerprint reader?

Anyway, all laptops I have seen include either a generic Windows OS installation disk, or an option to order one for the price of mailing cost. But of course even with these you might have something included which you do not consider "only the OS".