[charliewaddell24]

This is an update to a post from April of 2008. I use Windows Vista on a Sony laptop and from time to time when I boot up, my windows would pulse and pop up windows that allow selections such as the "shut down, restart, sleep" closes too fast to select. What I found is that I'm using an external 4 port USB hub (powered by the laptop USB port) and connected to the hub were two external hard drives and two thumb drives. If I boot up without the hub plugged in, the pulsing doesn't occur. I believe the voltage regulator, etc. cannot handle that much power sourcing during startup and that does something to Windows. If I plug the port in after startup, the pulsing never starts.
Simply unhook any external USB devices, reboot and see if that fixes your problem.