If you don't recognise the desktop screens I guess you have to look eg Has it got Control Panel - then its Windows.
Trouble is Windows 7 can look completely different to Windows 8 at Desktop.
You'll need to find out what OS so you can also download the drivers you need for your laptop.
If this is a hard drive with the OS on it you might have to re-install it too depending on whether its a reatil version of Windows or OEM (pre-installed)
I put the hard disk in the laptop, but there isn't have any Disk Drivers on it, it only shows SAMSUNG HN-M500MBB SATA Disk Device. That isn't my hard disk drivers....
My hard drive is WD Elements 10A2 USB Device (I test on my computer/pc) But when i try it on my laptop, it didn't show anything , only show
SAMSUNG HN-M500MBB SATA Disk Device.