Flash drive not working correctly..?

Ok, so I've been preparing to transfer over my files to a new laptop, by first saving the important stuff to a flash drive. Took about an hour or so to copy everything over.

I pop the flash drive into the gf's computer to test it, and nothing is loading up correctly. I go to open up a MSword document, and it wont load up the text, I try to open a picture and it says "no preview available". Also, when going to open a folder I had moved to the flash drive, its apparently empty now. What the hell is up with this thing? It's just a simple 32gb flash drive, nothing special or complicated. Yet it's not working.