PC-Cillin: Locked Out?

I just started getting this message in a popup:

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The entered serial number has already been registered. Please click Verify User
link to confirm you are the original user.
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My kneejerk reaction is that when I re-imaged my PC, something changed that
TrendMicro was using to surrepticiously ID my box and now they think the product
is being used by somebody else.

How to get this thing working again? Followed instructions on various screen
options they offered up (like pasting in my registration code and a couple of
other thing...) but all I get is no response, or an error like "Invalid
registration entered." - but it's the same registration that I got with the
product...

Doesn't sound good to me...

Anybody been here?
--
PeteCresswell