Revision of TDS return

We have filed form 26Q for Q4 of the FY 2010-11 on 25th of April 2011, now we want to revise the same but for revising the return we need FUV file which is to be provided by NSDL and  for getting that FUV file we need to register our TAN on NSDL site.But at the time of TAN registration the mail id has wrongly been mentioned, now we are not able to log in our account. So pls let us know the remedy available in this case.

Thanks in Advance.