How do I change installed parameters without first removing registry entries?

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]>
I used something like this to install blat:
 

 blat -install smtp.xxx.yyy [email protected] 1 587 -u [email protected] -pw password
 

 this works fine and allows sending mail without re-specifying all those parameters.
 

 However, from time to time I change my password at my mail provider.
 

 Making the appropriate password change to the above install line and re-running it doesn't record the new password. So subsequent uses of blat get a "not authorized" message.
 

 My workaround has been to delete the blat keys from the registry and then re-run the install with the new password.
 

 Is there a more appropriate way to change the saved password in the registry?
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