Have you tried either cascading windows to see if this brings the calibre window into view or hitting alt-space, then click on M(ove) and then using the left/right arrow keys to bring the calibre windows into view?
One other option is to hit Windows-Tab and see if the calibre window show up in the list.
If not, it suggests that you are having a video driver issue. A quick search on this forum will come up with quite a few threads on video issues and possible fixes.
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