My external hard drive will not mount

I unfortunately committed the cardinal sin and forgot to eject the hard drive instead I just unplugged it now it won't mount on my desktop I have a previous generation macbook pro and have tried it on windows on the macbook pro and windows on a pc no luck with any of them I am not to concerned about the data I just want to get the drive usable again.
Could anyone please help me out?

Chad: You'll need to use data recovery software to see how much of your data can be salvaged from the drive. Each of these DR utilities is available in a free downloadable demo version that will show you what the full version would be able to recover before you have to pay for anything:
Data Rescue
FileSalvage
VirtualLab
Note that you will need to have another hard drive with enough available space on it for all the files you want to recover. Nothing can be recovered and saved to the same drive it's being recovered from.

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