Strange. I entered the hub title and your name into Google so I could see the listing better. I didn't get the yellow notification. My guess is the type of warning a person gets is based on which type of warning system they have installed on their computer. I have McAfee and the "Site Advisor" displays a green check mark next to the link telling me the page is safe. According to the explanations provided by McAfee, the green check means the page does not contain malware or spyware downloads or anything else that would harm my computer.
Since you get the yellow warning. My guess is your system is more sensitive. That doesn't always mean the site has a bad reputation, it can simply mean there's something in HP's background coding that your system interprets as possibly harmful. Unfortunately, people who get that warning and have never visited HP or know anything about it may heed the warning and not read your page.
I don't know if there's anyway to fix the problem. I know HP is a reputable and safe site to surf, but not all software created to protect people's computers will view it that way.