I've just installed Toucan 3.0.4 directly onto a PC running Windows XP, I've previously used an earlier version off a USB stick without any issues but with this new install I've experienced multiple lock-ups. The Toucan application can be closed but it leaves a process "Toucan.exe" listed in Task Manager that can't be killed off. At the same point, any open Explorer windows stop responding and I'm unable to start any new applications.
Even requesting a full Shutdown fails and the PC has to be hard powered off in order to recover.
I'll see if I can dig out the USB stick I used before and let you know if the problem persists.