Being the next version of the Windows operating system,windows 7 has the powerful Windows Calculator which look like Vista's.What it can do?such as converting units, doing all the normal calculator tasks.Also it has a scientific mode and Statistics Mode and a new Programmer Mode.
Are you want to install windows 7 to have a try.Don't worry.If your computer run vista,you can get this calculator luckily.
First,Go here to download the Windows7-calculator.zip file.
Then Extracte the file and click calc.exe to run it.
If you don't like the Windows Vista calculator and want to replace it.
Open the Windows7-calculator directory which you have Extracted.
Copy the calc.exe file in Windows7-calculator directory to replace the calc.exe file in C:\Windows\System32\
As the same,Copy the calc.exe.mui file in Windows7-calculator directory to replace the calc.exe.mui file in C:Windows\System32\en-US\
Now you make the Windows 7 calculator as the default calculator in windows vista successfully.