Q: I can't open Itunes on my laptop

Since you post this in the iTunes for Windows forum, I'm guessing you are using Windows. What version of Windows are you using? Is this the latest version of iTunes, 12.4.2? What troubleshooting have you tried? You may want to remove and reinstall iTunes, using the instructions in this support document. Remove and reinstall iTunes and related software components for Windows 7 and later - Apple Support

If you encounter any further issues with reinstalling or using iTunes in Windows, check out this ASC User provided tip sheet, which contains comprehensive tips with troubleshooting iTunes and Windows. Troubleshooting issues with iTunes for Windows updates

If removed all of the components of iTunes as described in the support document I linked for you, it would be nice to know what version of Windows you are using. That helps some, but then take a look at the other link I provided you about troubleshooting and you should find help there.