got hwid banned on valorant, is it my account or my whole pc

that's an hwid ban. it's not attached to the account, it's attached to your hardware. disk serials, mac address, gpu id, that sort of thing

so making accounts does nothing until the ids change. you were basically re-logging into the same flagged machine

vanguard is the worst one for this too. it's the whole reason spoofers exist

does a windows reinstall fix it

sometimes, partially. it won't touch disk serial or mac. people reformat, get banned again, then buy a spoofer anyway and have wasted an evening

spoofer is cheaper than a new drive, that's the honest comparison

run the spoofer and the cleaner before you launch, not after. launching first and spoofing later is how you get reflagged straight away