Hadoop.cmd fails to initialize if user's %path% variable has parenthesis

Hadoop.cmd fails to initialize if user's %path% variable has parenthesis.
This happens in "updatepath" module while tring the add Hadoop_bin_path to %path%
Repro:
1. Create a folder C:\random()
2. Add this path to %path%
3. Start Hadoop command line

Error:
"<path_after_c:\rand()>"; unexpected at this time

Reported by Ramya Nimmagadda.