I like this one because you can see a running tape of what you have entered and such, if you choose that option in the preferences. Old school, but that's one of the reasons I like it!

Moffsoft FreeCalc is a great replacement for your existing Windows® calculator. We took the standard Windows calculator functionality and added the following features:
Adjustable calculator size - Make it any size you want and Moffsoft FreeCalc will remember the size and position next time you use it. (see example)

Tape - Save, print, or clear the simulated paper history tape.

Color schemes - Select a color combination or use your Windows color settings. (see example)

New keys - Clear Tape {CT}, double zero {00}, triple zero {000}, and memory subtract {M-} keys have been added.

Visible memory value - You'll always know what's in memory because it's displayed on the calculator status bar.

Option settings - Flat buttons, always on top, tray icon, run on startup, and hiding the tape are some of the calculator options. (see example)

Digit groupings - Number groupings for easy to read numbers
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International support - Digit grouping and decimal point characters change based on your regional settings. (see example)

Tray icon - Turn on the tray icon for quick and easy access. (see example)
System requirements - Windows 95/98/Me/NT/2000/XP

http://www.moffsoft.com/freecalc.htm

Enjoy the journey!