If jre is removed after unchecking the "Enabled" option inside the Java Tab of java control panel, then user cannot enable it again using Java tab if same version of JRE is installed again

Steps to reproduce:
   - Install 7u21 (latest nighty build)
   - Goto Java tab inside JCP and uncheck the "Enabled" option
   - Save settings
   - remove 7u21 and install it again
   - Go to java tab and try to enable 7u21 again, if it fails to work then bug is reproduced . As a result applets/applications fails to load using 7u21

Workaround : remove deployment.properties file form dep_user_home, now you can see java is getting enabled