My desktop is XP Pro; My now-deceased laptop was XP Pro; the new laptop is Win7 Home Premium.
XP seemed to have a cleaner look and a "looser" feel.
I upgraded the desktop from Win2k, which I upgraded from WinNT. I bought the old laptop with XP Pro.
Current laptop has a Pentium processor. Desktop and old laptop had Celerons.
New laptop has 4 gigs RAM and 500 gigs of hard drive; both older ones have 512 megs ram; Desktop has 320 gig hard drive, old laptop had a 30 gig drive
. All of this run through a Belkin wireless/wired router, along with a HP wireless multifunction printer.
Not too bad for a system set up on the cheap. I even did my own cabling and made all my own patch cords.
Next upgrade is the TV (if the War Department agrees
).