You have to be more specific. What is your PC's specs? The easiest way to improve boot time is is install an SSD as your boot drive. That's assuming you don't already have one. Going through your startup programs and eliminating ones that don't need to run when you boot windows will help also. Beyond that, it's gets a little more complicated.
The hardware way of improving the boot time of Windows is by Using a better processor than the current one, Using dual-channel memory and the third step would be to use an SSD if you don't use one in the first place.
The software way to do that is to find out the programs that have an "auto-run on the start-up" feature enabled and remove them from that list.
I would update this comment if I get hold of any other trick.
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