Saw your computer specs in your profile. A Phenom II processor should work reasonably OK. I'm running another system on an overclocked Phenom II x4 and it works fast enough for most GC games.
Are your video card drivers up to date?
Are you really running Windows Vista x86 as in your profile? Not sure how compatible Vista is... I have not run it in years.
Try to run the latest stable version of Dolphin: 4.0.2 rather than development builds.
Let us know what your error messages are.
Do games other than RE remake work?
Do other D3d applications work on your system, such as other games?
Are your video card drivers up to date?
Are you really running Windows Vista x86 as in your profile? Not sure how compatible Vista is... I have not run it in years.
Try to run the latest stable version of Dolphin: 4.0.2 rather than development builds.
Let us know what your error messages are.
Do games other than RE remake work?
Do other D3d applications work on your system, such as other games?