Many people are facing problem regarding working of the Windows 7 Calculator. The reason for this is that you need to have Microsoft .Net Framework 3.5 installed. You should download the Microsoft.net framework 3.5.
Thanks go out to “Grdcityboy” From http://deviantart.com for this great Windows 7 tool for windows XP & windows vista.
Enjoy this great Windows 7 tool, don’t forget to say thanks to Grdcityboy for his great work on this.