Originally posted by electricdawn:

Completely uninstall the game and manually(!) delete the Valheim folder (if one is still there) from the Steam library. No need for your son to get offended. It's not his skill assembling computers that should be in question here. ;)

Mods can be tricky and persistent.

Lol tell me about it! I deleted it from vortex originally and the blasted thing kept reinstalling haha. Yeah I uninstalled it but didnt do the manual delete. So far so good but if it goes again ill do the manual one :)