From Aurelio:

I had 7u3 JRE installed on D: (x86)
I installed 7u4 and it defaulted to C:
The installation removed 7u3 from D: but the Path variable remained pointing to the D: drive instead of updatin
g it to C: so "java -version" stopped working.
OS: Win 7 Home Ultimate.

Makes sense that 7u4 would uninstall 7u3 and install on the default location again, because we didn't build 7u4 with PIP. Users can again change the "change folder" to c:/ if they like.

We need to find if the "java -version" not working is a real issue.