Well this is the Phex forums. So you're using Phex are you? It's a great program try it out!

Your LW is probably disappearing due to a spyware program. Most likely cause. Put LW on its exception list or get a decent spyware utility. LW does not have spyware but some utilities are poorly designed & think it does.
And you should never use the Add/Remove control panel to uninstall LW. That's not how you installed it was it. Only use Start menu > Programs > LW > Uninstall