I just used 64-bit win7, and it takes about 30 to 40 minutes to boot. It wouldn't be like this if I cleaned it often. Drive C generally doesn't have much reaction, because what you installed is not in it, the system is slimmed down, and all the unwanted languages are deleted. It will be better. Thank you. Remember to adopt it as the best. It is difficult for me to finish this task. Please.