Can I upgrade Windows Vista to Windows 8.1 in an existing Boot Camp?

I have a Full Version 64-bit Windows 8.1 disc and my iMac has the current Version 10.9.1 OS X (Mavericks) installed.
I already have a Boot Camp partition  of ample size (100GB) with Windows Vista.
Can I upgrade to Windows 8.1 within my current Boot Camp environment or do I have to completely remove and rebuild my Boot Camp partition and Windows software?
Thanks,
David

I've tried both independently.
The one I upgraded from Windows 8 to 8.1 had graphics driver problems but I eventually got around them by deleting/installing the drivers in safe mode.
The Windows 8.1 that I'm currently using installed fine and I've also installed 2 Nvidia driver upgrades direct from Nvidia.
But as I said earlier, I may well have just got lucky with my hardware. Others have definitely not been as lucky as me.
It really depends on how much you want to upgrade and what the risk is to you if things don't go well.
You could lose everything in Windows. I would recommend making an image of your Windows partition (I use Clonezilla Live - which is a bit involved to use, but it works).
The risk is yours 

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