The safest and simplest way to partition your drive is to use the Windows 7 “Disk Management” program, to shrink your existing windows partition. To access this program, click the Windows icon in the bottom left and in the text box which says “Search programs and files”, type in “Disk Management” (without quotes) in this box, and press enter.
In the new window that pops up, you’ll be able to see all of your partitions. In windows, these are typically labeled with letters, such as “C:” or “D:”. Check your partitions - there are two common setups. Either you will have one very large drive (“C:”) or you will have a smaller drive for your operating system (“C:”) plus a larger one for data or programs (“C:”).
On your larger partition, ensure that at least 30GB of free space available. Next, right click on this drive and select “Shrink Volume.” It will take a little while for windows to analyze available free space, so be patient. Next, it asks how many MB you would like to shrink your volume. For a typical Linux OS install 30GB should be plenty if you’re not planning on using it to store large files such as movies. So, to shrink by 30GB, convert this to MB (multiply 30 x 1000) and enter this value (30000) into the appropriate field. Next, click “Shrink”.
You should now see a black bar which says 'Unallocated' underneath (see picture 2). If you see this, you are ready to go, and can close the Disk Management window.

Dual boot Windows/hypervisor for a single computer lab

So, I'm looking to do a virtual lab with 2 Windows servers (probably 2012 and 2016) and 2-3 windows 10 workstations. Going to create a domain with AD, DNS, DHCP, etc. Question is: has anyone, or can you, dual boot something like Xenserver (not stuck on this, any hypervisor recommended) with my main Windows 10 computer?

What I'd like to accomplish is to have a router set up to be on it's own network, plug my computer into the router, boot into the hypervisor and do my lab stuff on my main desktop. When I'm done, shut it down, swap the cable back, and boot into Windows. Realistically, I'd probably use this 1-2 times a week depending on how much free time I have.

I already had plans on building a new computer with an i5 7600k and 16gb of memory. I already have the storage space to accommodate the VMs. I'd like to justify buying just the main computer upgrade as opposed to getting both (lab and computer). Also, I don't have a ton of space for additional equipment (though I could make it work with a microserver) and it would be great to work from my desk. Likely if it's not feasible to dual boot, I'll forego the new computer for the lab since I'm determined to get a lab going.

So, TLDR:

1. Can I dual boot a hypervisor with 2 servers and 3 workstations (I'll be swapping my network cable into a DMZ'd router, not a big deal, closet is 6 feet away) from my main desktop? And is there any recommended hardware (looking at 7600k and 16gb of memory, I have storage covered)?

2. If 1 isn't feasible, which microsever is recommended for what I'd like to accomplish? I was looking at the HP Microserver, but there seems to be multiple versions with different hardware configurations. I don't want to over do it, but I don't want to not be a little future proof either. I'm not as well versed with server hardware as I am with desktop hardware.

For the record, based on my search of this subreddit, I'm going to be looking into a Ubiquiti Edgerouter.