Trigger installer to reboot if Sun VM is running in IE during Java Update

If users already have Sun VM installed
(especially when our JRE becomes highly popular among PC OEM) and get
plugin running in IE, installing a newer version of JRE through manual
install or Java Update may have side effect. Basically, if the users are
running applets with a version of JRE and keep the browser window open,
after the new JRE is installed, reloading the applets will result in the
new JRE being used to run the applets, and this will result in VM
collision in plugin.

        This problem has been there all along since the first release of Java
Plug-in, but users may run into this more often as they use our VM to
run applets more frequently.