Possibly a result of UAC. Are you trying to run the console/uninstall as the same user you used to install it (or at least an administrator account)?
UAC Already turn off . User having admin priviledge
Ah..Be careful not to fall into the trap of administrators and admin privilages on Vista and Win7.
A person with admin privilages is NOT classed an administrator when logged into the desktop. Make sure you right click and 'run as administrator' when running the console.