Install Mathematic Equation Add In for Microsoft Office

.NET programmability support for microsoft office required to download mathematics add-in 

Windows XP

1. Go to Control Panel
2. Double-click Add/Remove Programs.
3. Click once on the Microsoft Office 2010/2007 entry and click Change.
4. Select Add or Remove Features, and click Continue.
5. Click the plus sign next to Office Tools.
6. Click Equation Editor, and select Run from My Computer.
7. Select Microsoft Office, and select  .NET Programmability Support.
8. Click Continue. Click Close when the install is complete. The Equation Editor will be available under the Insert menu.