[Xtreme2damax]

Does your hardware meed the minimum requirements? If you are not sure read the following linked thread:

Dolphin Requirements

Also read the following sticky as well, which may offer some useful tips on using Dolphin:

http://forums.ngemu.com/dolphin-discussion/119724-frequently-asked-questions-faq-about-dolphin.html

Other things you may want to try is, upgrading video card drivers, tinkering with graphics options in the configuration, ensuring your game is compatible, use a newer build.

Just a quick note, the DirectX video plugin is broke as of revision 3627. This means that even the old DirectX video plugin can not be used anymore until the developers fix this issue.

 

[Xtreme2damax]

Did you overwrite the sysconf file in /User/Wii/shared2/sys?

When you copy the Wii OS over, you aren't supposed to overwrite this file although I've never heard of it causing this type of problem.

What operating system are you using? If it's Vista, I'd make sure to Dolphin folder has full read/write permissions for your account.