up2date problems

[Allen, Jack]

        After registering the system with RHN I tried to run up2date and
this is what I get. 

(mckstardb)root# up2date -l 
*** glibc detected *** double free or corruption (out): 0x096d79c8 *** 
Abort 

Where do I begin to look for the problem? 

If a program or glibc is corrupted how can I correct this from the CDs? 

I am afraid the backup that was done will have the same corrupted
program in it. 

Thanks: 
        Jack Allen