I can not see font colors or background colors in excel work sheets (in power point is always set to grey scale and always required to click view,color tabs to get colors). Can somebody help me?

Hello Mohaniml,
I think your formatting tool bar is not activated in your excel. Click View menu > Tool Bars and Click Formatting. A tick mark will come against formatting tool bar and you will have your tool bar with an alphabet "A" which has got a drop down arrow. That is for font colors. Just before that 'A' there is another icon with a paint jar, again with a drop down arrow which will help you to give background colour.