Problem with a 500GB Seagate expansion external drive

Ok, something weird is going wrong with a seagate drive I bought for my girlfriend. Its working perfectly fine on my computer, and it did initially show up on her laptop too. However, her laptop froze up completely and it had to be shut down via the button while it was plugged into the laptop. Now it doesnt turn up in My Computer, but only on her computer. Its present under devices, but nowhere else. Any help would be greatly appreciated and Id be happy to give any more details anyone might need to help me out. Thanks in advance.
 
Then you have to follow the "Windows trail" in left-to-right order of checking in

Device Manager => Disk Management => My Computer and Explorer​

Have you verified it under Disk Management?

==> Disk appears?
==> Partitions defined and formatted (FAT or NTFS?)
==> Is a drive letter assigned?
 
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