can anyone help me step by step or link me on how to install old hard drive to my pc?
okay, i bought a 1TB hard drive and installed windows 8.1 64 bit on it and installed it as my primary hard drive for my computer.
now, i have an old 500GB hard drive that still have my important documents in it and i was wondering if i could use it as my second hard drive and use it as my storage hard drive.
but my old hard drive have windows vista and i'm currently running windows 8.1...
will i be able to open my old hard drive and maybe retrieve some of the important documents from there?

yeah just plug it in
make sure it boots from ur 1tb HD, then you can just open up the 500gb in "my computer"

you'll probably have to go to Disk Management and give it a drive letter before it shows up in My Computer

Just plug it in and make sure your BIOS chooses the correct drive to boot from.

ahh no wonder it was giving me trouble at first!
thank you ^^ and thank you guys! it's working now and i am able to open it through "My Computer".
thank you all!

When you get all the stuff you want, off of it, then format it to remove Windows Vista.