Why do I get an error message while cracking MD5 Hashes?

[Fran]

In this format:

540f8212435d24a5ff5ed590b84e9e1c

I look for the pass and it's lostlamb.

Then I'm trying with this one and I get ????? as the pass:

6496a5969321ee85c255c636248fea41

Why does it turn out as ????? pass and not a word/number one? Thanks.

EDITED: I pasted the wrong string the second time.

[Horde]

Because MD5 is a one-way hash.

You cant decode it.

All you can do is try brute force it/read a rainbow table.

I take it you are using gdataonline.com?

[Fran]

Yes, I'm using that one.... is there any way to manipulate or w/e to get the password from that string?
Automerged doublepost:
The one I'm trying to get is:

6496a5969321ee85c255c636248fea41

And I get ????? as the pass.

[Basco]

Try getting a brute forcing program and try it. MD5 can't really be decoded.

[G3]

????? means they don't know what it is

[Personoid xX]

If you wan to brute force it then you could try downloading Cain.
Link
But it could take years...

[Fran]

Thank you very much everybody

[iPoison]

Originally Posted by Personoid xX

If you wan to brute force it then you could try downloading Cain.
Link
But it could take years...

Personoid is right, it could take years.
And it most likely will.

[Personoid xX]

I tried to brute a pass once.
Said it would take 20 years.
No joke.

[Fran]

Ohhhh... I thoutght it was metaphorical o_O