"I assume if I buy the Dell’s Window 7 it would make the installation easier than buying from another third party." No, it would be exactly the same.  Shop for the best deal, but buy from a reputable seller (Amazon, Newegg, etc.).
I have a Dell Inspiron 1520 laptop running Windows XP. I have until April 2014 to switch to another OS. What I have in mind is to install Windows 7 on my laptop. Can anyone help me where I can get the required Windows 7 Professional software for my computer? I assume if I buy the Dell’s Window 7 it would make the installation easier than buying from another third party. Thanks!
Upgrading to Windows 7 Pro