I wasn't offended---just confused.
You have the right web site, but the wrong location at that website. I don't see download links at the location you provided.
Try this: Official Windows 7 SP1 ISO from Digital River « My Digital Life
Scroll down until you find your exact version. Be sure to get 64-bit or 32-bit, whichever you have.
If you use this to install, you will no longer have whatever other stuff beyond Windows that HP may have included from the factory.