[expert] rpm troubles in LM 8.0

[Bobby Welch]

Hello,
   When I install an rpm (rpm -Uvh filename.rpm) everything goes ok.  
But, when I go to unistall the rpm it says that the rpm does not exist?  
But, if I try to install it again it says that it has already been 
installed?  I even try to update the rpm data base (rpm -i --rebuilddb) 
but I still cannot unistall rpms.  Anyone have any idea what the problem 
could be?

Thanks