Formatting Cells using Excel: Automatic input of 2 Zeros

Hi there TechyV experts.
I am currently working in a financial institution which requires me to enter account numbers in Excel. All was fine until I encountered an issue which I cannot get out with.
This entails an account number with two zeros at the beginning. Of course, I cannot specify the exact account number, so I apologize for that. I tried typing the account number in Word, Notepad, Wordpad then pasted it in Excel, but just the same, it automatically omitted the two zeros.
I tried to look in formatting the Excel, but I cannot seem to see any option that would retain the two zeros at the beginning of the account number.
Hope somebody can help please.
