[CentOS] duplicate packages on connection reset

Hi! I have a small problem with some packages : i was doing an update
over ssh and my connection was interrupted .. now i have a lots of
duplicates and if i try to remove them, yum tries to uninstall all
system (447 packages 1.4 gb)!!

Any idea how can i clean this mess? would be pretty bad if the machine
needs to be re-installed only because the connection went bad during the
process...

Thanks for any info!!
Adrian