I click on Nitro Pro 8 and it says my computer has been backdated

I Received a Message About Backdating. What Do I Do? If you receive the message below it means that your computer date has been changed to a point in the past. Either the date was set forward and you just fixed it, or it was set correctly and you just moved it back. In both cases you will receive the following message:
Express is designed to protect against backdating, as it causes major database integrity errors. If you received the above error, you should:

• Move the computer date to today's date, or
• Keep the computer date as today, restore your database to the backup made on what the computer thought was today's date, and re-enter all transactions and changes made in the database between the date that the computer thought was today (probably yesterday or the day before) through current.

When you start your computer, push on del or f2 or any combination to enter your bios. Then look at the systemtime in your bios and change if neccesary (I think it is) to the right time and date.
If after a few days of inactivaty with your computer ( in the off setting) this happens again you must put in a new 3 V. battery.
Non comparaties in bios clock and the windows clock will give problems with your browser and some programs. Good luck.