It gives the path to the settings in there:
C:\Users\(user name)\AppData\Local\Google\Chrome\User Data
In there should be a folder called Default. I've never used Chrome, but it looks like it works just like backing up a Firefox profile. Save the contents of the Default folder to a flash drive, reinstall OS, reinstall Chrome, run Chrome, and it will create that Default folder again. Go in and replace the contents of the new Default folder with everything you saved from your old Default folder.