I had same problem. My ReadyBoost is turn off when I reboot my laptop.
But I solved this problem!
My laptop bios has this options:
"USB BIOS Legacy Support."
If it is enable, my USB devices are turn on when laptop starts, if it
is disabled devices are turn on when my VISTA load.
I set "USB BIOS Legacy Support." - disable , and it solved the problem.
I think you have same problem.
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serafimpanov
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