The environment variable (system) path shows some doublets; I'm not sure it could help, but you can remove them (the doublets):
I'm not sure what you mean by this. Could you explain a little more on it?
Control Panel\System and Security\System - advanced system settings, (click
yes in the UAC window that should appear if you didn't disable it), click
environment variables, double-click
path under the
system variables pane (or click it once and then click
edit), remove the doublets, click ok, click ok.
I also observed in the past that some environment variables inside other environment variables could cause strange behaviours, therefore I'd also substitute the text of those variables.
Example:
%systemroot%\system32 would become
c:\windows\system32.