you can google slic2.1 and just learn how to fresh install using your OA license. it is 100% legal since you bought the computer. Essentially grab a retail/technet cd and install it without a key, grab the cert off the dvd or online and the key (off the sticker/dvd/online).
you will forever have a misaligned SSD and that can impair wear leveling and lifespan. reloading your pc, clean without the poopware that hp loads is a very very smart thing to do. i'm gonna just say trust me on this one. it is the best way to go if you have the skills/resources.