Sounds a lot like Hypnospace Outlaw, which came out a few years ago and had you exploring a fictional Internet from the mid/late-90s era on an OS designed to mimic Windows 95/98 (with an upgrade to an XP-like desktop later in the game). You were basically a mod/censor who went around and busted people for copyright infringement and stuff. Also a real nostalgia trip if you miss that kind of aesthetic.