Do you mean that you have simply hooked up the hard drive by itself in another computer?
You could try putting your hard drive on as a "slave" to another hard drive in another computer. I think that you should be able to get into your files that way. But, I'm not totally sure, because I have not had to work with a hard drive that was password protected. Depending on the brand of hard drive that you have, you may need to do some configuration of jumpers on the back of your hard drive in order for it to function as a slave.
I'm no computer expert but, I do have some experience with them. Maybe someone will be able to give you helpful advice also.
Information on the following sites may also be of help to you.
How to Install a Second Hard Drive | eHow.com How to Change the Master/Slave Designation on a Hard Drive | eHow.com