Use the Windows Media Creation tool from https://www.microsoft.com/en-us/software-download/windows10 to make a bootable disk or stick and use that. If it fails as an upgrade, do a clean install (use your Windows 7 key as license key). Be sure you have a good backup of everything you don't want to lose.
And hurry, you've got 2 days to install it for free.
I have an HP DV&-3180us laptop. I've been trying to upgrade to windows 10 for over a week. Every time I try to download win10, it goes to the "starting download" screen and stays there. I've left the computer run on that screen for 8 hours without it changing.
I tried to make sure my windows was updated thinking it would fix it but when I go to update windows it says "checking for updates" and hangs there.
I restarted in safe mode and ran a virus scan, malwarebytes scan and superantispyware scan, all came up clean.
Also in safe mode I did a disk clean and it had 10 GB, YES, 10 GB of windows update errors.
I tried to do a system restore 5 times to 5 different dates and they all failed. It said something like "System restore failed because computer was unable to locate the "C:" file". Which, I know C: is the hard drive but I'm not sure what it means by the "C: " file.
I'm out of ideas. Other than the upgrade/update not working the computer is working fine.
So yeah, any help would be appreciated.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic