Recently I was prompted to upgrade the U3 application on my SanDisk U3 Cruzer to the latest version (currently U3 Launchpad Version 1,6,1,1). I did this on my laptop running WinXP Pro SP2. After upgrade, Thunderbird will no longer run on the laptop. Attempts to start it result in no activity. Other U3 programs (Firefox, for example) will launch and run OK. I can move my USB drive to my desktop, and it functions fine and Thunderbird runs. Unfortunately, I had Thunderbird running when I upgraded (yes, in hindsight, a weak moment.) I was wondering if there were any files that may have been "stranded" by the upgrade that is preventing Thunderbird from running. Thanks for any assistance.