To uninstall the HP Games that come pre-installed on your computer, click the start menu and navigate to the control panel. From the control panel, click "Programs and Features," and find "HP Games" in the list. Once you've found it, right click it and click uninstall.
This type of software that comes pre-installed on most name-brand computers is commonly referred to as bloatware. You generally don't have to have any of this software installed on your system, and you'll usually see a noticeable improvement in speed by removing as much bloatware as you can. If you'd prefer to have a program to assist you in removing bloatware, download the Windows PC De-crapifier at Decrap.org.