@Brooks50 , welcome to the Community.
@Brooks50 wrote:
Can HP Pavillion SlimLine Model No. s5-1224 Upgrade to Windows 10
Yes, I believe that it should work fine. Here are the System Requirements for Win 10 and the Product Specifications for your computer. You can compare the two documents. I am not certain if you will be able to do an upgrade from Win 7 to Win 10, however. If not, you should do a clean install using these tools.
During the install it will ask you to enter a Product Key. If you don't have one, simply select I don't have one (or some such words). You can select the version that you want to install, for instance, Windows 10 Home, and buy the Key later.
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I am not an HP Employee!!
Intelligence is God given. Wisdom is the sum of our mistakes!!