Michael John Scerri :
while installing windows format the drive and you are golden. And make sure the hdd is sata not ide or elsu you need to buy an adapter link to sata picture : http://www.legitreviews.com/images/reviews/955/wd_scorpio_black_sata.jpg
However formatting will delete the files he wants to save.
1. Install Windows
2. Install Hardware drivers
3. Install quality AV program https://www.av-test.org/en/antivirus/home-windows/
4. Run Windows Update the 26 times it needs to finish
5. Check for updated drivers
6. Connect old HD to new machine. I'd suggest a BlacX docking station appropriate for the type of HD you have so you can continue to use old HD as backup.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=blacx&N=50001379&isNodeId=1
7. Copy the stuff over
8. Format external drive and utilize for backup.