As you know Windows 7 contains a new redesigned Calculator which has new GUI and new options. You can get more information about it in following topic:
What's New in Windows 7: A Small Review with Screenshots
If you can't use Windows 7 but like the new Calculator, then you can get the same calculator in Windows XP and Vista.
Our friend "grdcityboy" @ DA has created a small application which looks very similar to Windows 7 Calculator:

Its fully functional but only "Standard" mode works because of limitations.
You can download it using following link:
Download Windows 7 Calculator for Windows XP and Vista
NOTE: You'll need to install Microsoft .NET Framework to be able to use this app.
Posted by: Vishal Gupta | Categories: Windows Vista, Windows XP
asd
how to install win7 calculater
mumtaz
thank you... nice code..
r
thanks man!