Maxtor OneTouch III headache

Widnows Vista is not recognizing my exteral hard drive. It shows up in Device Magager, but other than that: nothing. It won't let me boot to windows when it's plugged in. If I plug it in after windows boots, explorer will quit responding, then I have tounplug it so every thing will run.

I've gotten the HDD to run in Ubuntu, so I know that atleast the HDD isn't kaput. It has to be a problem with windows, my main OS.

 

To clarify, it works SLOWLY on Ubuntu, but that may be because I was booting from disk, because I somehow mucked up the partition. But it still WORKS, so I don't know what the problem is on windows.

 

It's NOT working on XP. So maybe it could be the HD, but why would it work on Ubuntu? What can I do?