Yes, you may run Windows 10. I have installed Windows 10 on Dell laptops the same generation and age as yours. First, backup your personal files to an external drive and save any licence keys you will need to reinstall applications. Then, do the free upgrade: [URL] After upgrading, check to see if Windows 10 is activated in Settings | Activation. If it is, then you can perform a clean install of Windows 10 and it should activate automatically. The clean install will result in a better system than just staying with the in-place upgrade. I wrote a detailed description of how to install Windows 10 and 11. It may help you. Here's another description of the install process, from a Microsoft MVP. Note that it would be best to have 8 GB RAM and an SSD. If you have only 4 GB RAM and a hard drive, you will find Windows 10 very slow.
Can I upgrade to Windows 10? It is now working with Windows 7.  
Inspiron N5110, upgrade to Windows 10