Can I upgrade? MB: Asus P8Z77-V

As @Berton stated, MS is still giving it away for free. I would make a Windows 10 USB flash drive with either the MCT or downloading the Windows 10 ISO file and making a bootable USB flash drive out of the ISO file. Do a clean install of the version of Windows 10 that the Windows 7 would upgrade to. Skip entering the product key when it asks for it during install. Once you get it installed go to the activation page and change product key to the Windows 7 product key.

If that doesn't work, then shrink the Windows 10 partition to make room for a Windows 7 partition. Install Windows 7. Activate it by phone with the Windows 7 product key. Once Windows 7 is reactivated on that computer, then you should be able to enter the Windows 7 product key in Windows 10 to activate it. We know this is still working, so far, with the current version of Windows 10 (ver 1607). When MS releases the creator's update in April, this capability may go away (or it might go away before then, too, if MS turns off free activations).

I stated earlier in this thread that I use a 'Asus P8Z77-V Pro' with W10 as opposed to a plain vanilla 'Asus P8Z77-V' There is no reason why the 'Asus P8Z77-V' won't work with W10, the differences are infinitesimal. Here's an article I found.

'The difference is very small indeed: - The pro has 2 more USB 3.0 ports. The last two, wont be quite as fast as the first two, since they are not native in chipset.- Another small difference is, that the pro has their Q-shield I/O anti-static back grill. Instead of their normal one. it got some metal padding, to better connect. I have no idea if it's better. Some users have reportet that it's a harder fit in cabinet.Main advantage is likely, that it looks better and descriptions of ports are clearer.'

Asus P8Z77-V or P8Z77-V PRO? - Motherboards - Tom's Hardware

Update: Have finished the rebuild (got a new case power supply and hard drives) and installed windows 10 onto my SSD, aside from some an error i got (0x800750 i think, it said files were missing or corrupt, I got a new boot usb and it installed fine so heres hoping), and windows not seeing my mechanical drive at first, I just hard to partition it and assign a letter to it, it has been great so far. It runs smoother and better than 7 which I had before, none of the issues that forums talking about p8z77-v compatibility mentioned have arisen so far. The common issues were wake/sleep not working and the realtek audio not working, both work fine for me. So knock on wood, I think I was stressing over nothing. Thank you for all the help everyone!