How to reopen all windows in Chrome?

When exiting Chrome, always use the Exit action from the menu.

This will close all windows and, given that you have Continue where I left off enabled in the options, all windows will be reopened when you start Chrome the next time.

It doesn't matter how many windows and tabs you have opened of chrome, and when you close the recent most window is opened. To open all windows separately and all the tabs in order you can always use this ->whenever you close chrome and then reopen it go to wrenchbar icon and select Recent Tabs this will show you the windows and the no. of tabs opened in each window. So you can reopen them again.

Though when you exit from chrome and then open it, it opens all the tabs from all windows in the same window.