Pop Up Msgbox for Expiry Dates in 3 columns

Hi,

I am preparing a excel sheet related to HR where it has all the information about an employee including Expiry dates of passport, visa and ID cards.
Now i need a pop up message which will remind me about these dates 45 days in advance. I have created an VBA program but it selects only one cell. I need the program for the whole worksheet. Need help urgently.

Thanks

I would use conditional formatting on the range rather than a pop-up.

Thanks..I tried conditional formatting and as you said it is easier than Pop Up Msgbox..