Hey there, Daniel Hart.
Usually there wouldn't be a problem for you to switch hard drives from different computers, but if you do that with a MacBook's drive and connect it to a Windows computer, it won't be accessible, because of Mac OS X's file system (HFS+), which is not supported by Windows. From what you've written I gather that the MacBook doesn't work anymore, so your other options are to download a 3rd party driver for Windows, which allows it to read HFS+ file system and see if the drive can be accessed when you connect it to the computer. Or transfer the data to another Mac computer, reformat the drive to the exFAT file system(which is supported by both Mac OS X and Windows), transfer the data back to the HDD and then...