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 working in Windows Vista.
"Anoop" @ Daily Gyan has posted about a ported version of Windows 7 calculator which works in Windows Vista without any problem, so you can enjoy the fully functional Windows 7 calculator in your Vista.

Download the ZIP file from following link:
Download Windows 7 Calculator for Windows Vista
Now extract the ZIP file and run the "calc.exe" file.
If you want to replace the default calculator with this new one, then replace following existing files with the new ones:
%windir%\System32\calc.exe
%windir%\System32\en-US\calc.exe.mui
That's it. Now you can enjoy the new Windows 7 calculator in Vista.
PS: You'll need to take ownership of both files before replacing them. Visit following tutorial:
Add Take Ownership Option in File / Folder Context Menu in Windows Vista and 7
Thanks Lifehacker...
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Faltoo
DUDE ITS COOL
Swapnil
Can't take ownership of original 'calc.exe' file.( I tried ur reg tweak. I have Norton UAC on)
VG
^^ Then try to turn UAC off.
raoul
i too was not able to take ownership of the original calc.exe file so i took ownership of the entire windows/system 32 folder, thats how i got it to work
Nik
@ Swapnil:
You can take full ownership of any file using command prompt. Type the following line for the calc.exe file:
cacls %windir%\System32\calc.exe /G username:F
(instead of username, place your actual username)
Though, I am having a problem running calc.exe. When I replace the two files, and click the calculator under accessories, I get a "calculator stopped working" error. Any ideas?
lexiz
I just pasted the windows 7 calculator in my system32 directory as calc (2).exe. Then I renamed the file in en-US as calc (2).exe.mui. then changed the target file in the start menu shortcut.
worked like a charm!
John
@Nik
Same error here, replaced the two files, but get "calculator stopped working" error.
LiMONA
@Nik & John:
You probably use x64 version of Vista like I do. Got same error here, but then i remembered and replaced the files C:\Windows\SysWOW64\calc.exe and C:\Windows\SysWOW64\en-US\calc.exe.mui and it works.
Hope it solves the problem.
richard
Why can't I take ownership on calc.exe
I think that take ownership tools can only work on any files except .exe
Any ideas??
infini3
I think Help->About is not working, isn't it? Any hint?