I did that once
The problem is that when you installed fedora, grub overwrote the windows bootloader (which is called 'NTLDR' IIRC). And when you got rid of the fedora partition the grub config files went with it.
Assuming you don't actually want fedora on your system, I think the best way is to just repair the windows bootloader. EasyBCD
seems to do the job (download link is at the bottom of the page). You'll have to burn it to a USB on another computer though.
And if you do want to keep fedora then try verifying the ISO
. In any case, try reburning it.