depending on your version of chrome you can do this:
enable the sync feature of chrome, sync your stuff to the cloud. that will include passwords, bookmarks, themes, extensions. reinstall your OS, reinstall chrome, reenable sync .. back are your things (yes, history is not among it). read more about sync over here.
zip the folder %APPDATA%\Google\Chrome\User Data (or any other backup mechanism) and then reinstall your OS, reinstall chrome and unzip your zip