i've bought a brand new flash disk cruzer titanium 4GB and was rather disappointed to find that it doesn't work on vista...and it works on xp fine.it appears that u3 is now compatible with vista but not for me.the launchpad version is 1.6.1.1
Update U3 from here http://www.u3.com/ If I may suggest, just remove U3 and get Portable Apps. I like it a lot more. http://portableapps.com/
Install the latest service pack 1 for vista and your flash disk cruzer titanium 4GB will be more than likely reconized.