I personally miss Windows 98. I'm aware of bugs and the boot time it took being longer than current boot times on decent machines. I miss the responsiveness of well-behaved applications. I miss having native applications. I miss having themes and fine control over colors and fonts that allowed me to change the look of almost every application installed due to everything being built with the same toolkit and inheriting the same settings. I miss being able to make pixel art in paintbrush (why did MS have to add antialiasing to paint?). I miss WEP games (Chip's Challenge is on steam, but I've never found a good Jezzball clone).

Also, I miss ZoneAlarm firewall. Windows firewall is sufficient for my needs, but I really wish there was a way to make windows pop up a prompt the first time an application tried to go online, and white/blacklist specific destinations from the prompt.

I miss browsing with less styling and images and such nonsense.