What operating system are you using? It looks like you have a version installed to D:\\toolbox\matlab - not sure why there are two slashes after the colon though. I agree with dpb that you should uninstall everything. If you're using Windows, then do it from the control panel "Programs and Features" icon. Then edit your path environment variable to see if it mentions any MATLAB folders. What might be happening is that some old version of MATLAB is on the search path so it finds it. If it does contain any MATLAB folders still (after uninstall), get rid of them and save the new path. Then reinstall.
You might also look at the command "restoredefaultpath".
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