If I am reading your post right you used a previously written hard disk to boot your newly built computer, is that correct?
If so then you are on a hiding to nothing and I am surprised that you even got it to boot at all. You will need to make backups of your important data and then format the drive and do a clean install of windows. I would suggest that you start from a clean slate and clear the CMOS and load BIOS optimised default settings first.