[Help] Cannot upgrade my Vbulletin

[Pedregal]

I have the 4.0.8 version and i ant to patch to the last version.

The problems commences when i put my customer number, appear:

        Customer number entered successfully.
        Redirecting...

And return me to the "Enter Customer Number" Screen.

I search in whole internet, perhaps its a cookie problem, i tried use the tools.php and the same result : i put the customer number, the tools appear, select one and return me to the "Put the customer number" screen.

Really its a painful work, i cant login to the my admincp / board too (and some members have the same problem).

I hope you help me to fix it.

Jonathan.