I have a HP Envy dv7-7233nr notebook pc built with win 8. I am going to do a clean install of Windows 7 pro SP1 64-bit System Builder "OEM" . I have never loaded an older OS over a newer version in windows so I'm sure I going to have some problems. One that I'm sure I'll have is the correct drivers for the hardware in my win 8 built computer, as I'm going to win 7. I'm not sure if the amd catalyst package will work due to lack of experience. I have an AMD A8-4500m APU with Radeon HD graphics and a AMD Radeon HD 7640G display adapter. Anyone out there that could shed some light on this subject will be much appreciated. In advance PLEASE and THANKYOU.