I'm not sure what your saying here. I think your saying that your being prompted that the USB is being installed each time you start the computer but what does "system speed" have to do with it? If you plug it in each time, well, that's what it does. If your leaving it in and it's prompting you then this is another matter. Please explain more fully.
my os is windows vista ultimate i am using a ready boost flash memory
but each time i restart my pc i have to click use this device for system speed. and windows is reinstalling the device any time i restart my pc. any idea.