Re: Windows error after installation
Sounds like you used the Slider in the installer to shrink the Win7 OS partition -- BAD idea! That has historically run the risk of corrupting the Win7 boot loader -- as you have now discovered.
While Win7 was working, you could have used the Backup feature to create a Win7 Repair CD for free; but now, it will cost you to do that. IF you go to the site below, you will find a link for the ISO image for that CD:
Buy the image, download and burn the ISO to CD, boot from that -- and run Startup Repair three times.
Ubuntu 16.10 Mate, Mint 18 Mate; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.