I have loaded my site on my localhost using Wamp Server 2.0. I have my template installed and joomla! seems to be working fine but when I install JMS the module menu is not appearing. The insall went successful, I registered and when updating patches I was kicked back to my login and the mosule doesn't show now not even in the module list despite trying to re-install. This happened on my web domain last night also as I was trying to set up a slave site. the module just seemed to vanish. Can you help me out pls?

I don't understand which menu disapear.
Can you give a detailled scenario and perhaps also screenshot to help me understand which menu is not displayed and disappear.

Which "menu" module are you using ?
mod_mainmenu ?

Is it the "JMS" menu that is not displayed ?
JMS can only be accessed with a "Super Administrator". If you are a base "administrator", you don't have access to JMS.