Great FPS but huge problem

[2side]

I've recently got Dolphin and Sonic Unleashed PAL version. I've been able to play it for a while, eventhough I didn't play through any of the stages. My problem resides on the simple fact that my game, starts off well, displays a controller error, normal for me,usually at 20-30-40 fps's, then just goes insane, reacing over 200fps's but no image display.

If anyone knows how to solve this or if the solution has already been posted, please give me the link. If anyone also knows how to play games simply using the keyboard, in Dolphin, please I'd like to know how to.

Thanks in advance.

System specs:
CPU: Intel Dual Core T3200 @ 2.00GHZ
GPU: nVidia GeForce 9300M GS 256MB DDR2 at 512MB due to RAM
RAM: 4GB DDR2
OS: Windows 7 Released Candidate x86 build 7200