If you're having trouble getting different windows to display in the Excel taskbar, there are a few things you can try. First, make sure that you're running the latest version of Excel. If you're not, you can download it from Microsoft's website. Second, try restarting your computer. Sometimes Excel can get "stuck" and won't display different windows in the taskbar unless you restart. Third, try opening Excel in Safe Mode. To do this, hold down the Shift key while double-clicking on the Excel icon. This will prevent some of Excel's add-ins from loading, which can sometimes cause problems. Finally, if none of these things work, you can try resetting Excel's settings back to their defaults. To do this, go to File > Options > Advanced and click the "Reset" button.