I have Mac OS X Server 10.6.2 as guest OS. The Parallels Desktop 5 is the latest build. PD always says "Parallels Tools are not installed. From the Virtual Machine menu, choose Install Parallels Tools." I already did that. 3 times in a row. It still tells me to install it. What should I do about it? I do experience graphic flicker in Bento, so I suspect something connected with Parallels Tools may cause that. Help plz.