I have noticed a wired error when I try to change the fonts in Microsoft Excel. Excel get crashed and close it self when ever I change fonts or make fonts bold. Then I try same with Microsoft Word and result was same.
Problem caused by the default printer drivers. When I remove the default printer to another Excel, Word start working normally.
Solution: To reinstall the printer drivers.
You can easily think that the problem comes from word or excel and I completely uninsulated Microsoft office and install it again and again but nothing was changed.