HDD Trouble shooting

hi my old HDD was corrupted it was a WD10EACS SATA 1.0TB HDD. I hvae had a new one to replace it same size. I have the option to add the old hdd giving me 2 hdds. i need to retrieve the data off the old HDD. When i connected it the OS would not boot. When i disconnect the old HDD OS boots normally. How can i Run Windows to recover the data off the old HDD?

Your problem is complicated by the fact that you are already having problems. Lets see if Ubuntu can help
Use Ubuntu Live CD to Backup Files from Your Dead Windows Computer - How-To Geek
If not successful, download and try recuva.

why wont the new hdd boot when i connect the old hdd. i set the new hdd as the priority boot drive!!!