Its not that we cannot make use of windows OS, we only have to be minded of using our crypto wallet on airgaped device, this is meant to be on a separate device other from the one we use in making our daily internet connectivity's, being online could place one on a fast track means to getting hack if care is not taken, because of you make downloads or click on links and visit some site, you're already under an attack, hackers can come in through any means common to these.