The GMA 3000 was primarily a 32-bit era chip. 64-bit drivers are extremely rare and unstable.
If you find the integrated driver hunt too frustrating, spend $15 on a used Radeon HD 5450. It transforms the machine into a far more capable Windows 7 system. But if you prefer the original hardware, follow the force-install method above, and you will have that satisfying Aero theme up and running in less than 20 minutes. hp dc7700 graphics drivers windows 7
While the official HP Support Site is the first place to check, they may sometimes list only older OS support (like XP or Vista) for this legacy model. The GMA 3000 was primarily a 32-bit era chip
Practical installation steps (recommended) follow the force-install method above