The best thing to do will probably be to make sure that you have got ALL of the updates installed. Then resave your company file to make sure that the saved files have also been updated.
This way when you reinstall the program all you have to do is to download and install all of the updates again. This should then make your version of Quickbooks the same as the previous version.
Obviously since you are formatting your computer make sure you have a couple of new copies stored on disks. I say a couple just in case.