In which order exactly it was?
I guess the two kills via task manager came first and the close button was the last try, wasn't it?
AFAIK only proper closing the popup window (via the close button) stops the popup from appearing again.
I'm on version 6 too and I got the popup about 2 days ago... I left it opened (purposely) and then had to restart the computer twice - the popup opened right after starting Sticky (even covering the unlock dialog so I couldn't get to it!).
Since the moment I closed the popup using the red close button, I have not seen it again.