I can’t remove Parallel desktop from my Macbook.

Hello everyone,
I've installed Parallel Desktop on my MacBook to use Windows parallels but after some days, I recognized that my MacBook's performance became slow. I don't want to use it anymore. I installed the parallel desktop CD and the window appears with 'Uninstall Parallels Desktop' option. I've followed all the steps, but still can't remove it. I need to uninstall it. Please help me to do it.
Regards,
Rashed
