I remember actually been disappointed I spent 5 days downloading a beta build of Windows XP on dial-up internet, only to find it wouldn't work on our family computer. When the Windows XP boot logo appeared the computer would just switch off... for what ever reason the PSU would run Windows ME perfectly, however couldn't supply enough power for XP to boot.
Eventually I persuaded my Dad we should replace the PSU in the PC. With the PSU replaced XP actually installed and i could finally use XP for the first time. I remember been stunned at just how much of an upgrade XP was from Windows Me. XP didn't crash, back then i was used to Windows ME blue-screening every hour or two.
On Windows XP I loved how multiple users could be logged on at the same time, this allowed me to stay signed in to MSN Messenger when someone else wanted to use the computer, which was great when sending files to friends and getting messages. Back then MSN was basically the equivalent of a mobile phone for myself and friends, few of us had mobiles at the time.
The theme community back in the XP days was amazing too, i had a different visual style every week (anyone remember Style XP?). I always remember thinking Microsoft could never improve on Windows XP at the time.
I actually ran Windows XP our family's first (and only) computer for several years, this was a Pentium 2 @ 300mhz, with 512mb of ram.
Here's a really old screenshot i took in March 2003 of XP running on this PC:
Don't ask about the sheep, i was young lol... this PC still actually works and has Windows XP installed, however has not been used for many years now.