Make sure that the air ducts are free of dust and other debrits. Also, check that there is nothing obstructing the air vents.
Do the same for the heat sink for the CPU and GPU.
Any dust impede the air flow and act as thermal insulation.
This, in turn, make those component run hoter, requiring more work from the fans, causing more noise.
Cleaning the accumulated dust should be done yearly for most peoples, with some situations demanding more often.
If you want to disable a periferal, you need to open the device manager.
Fing the periferal, in your case, a video card.
Double-click it to open it's properties.
Click the checkbox titled "Don't use (disabled)"
Switch to the power management tab and sellect "Turn OFF when not in use".
Click the OK button to apply and close.
Done, set to stand by mode with strict minimal power use that don't need cooling = No fan noise for that video card.
Once it's done, you can uninstall the relevent drivers.
If you want updated drivers for your AMD video card, and HP and Microsoft don't have them, you can go direcctly to www.amd.com to get them.
You may switch so any Linux distros, like Ubuntu, Mint, Fedora or Slackware. Be forwarned that you'll be faced with some re-learning to do several things that you do now without even thinking about them.