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Sorry to hear about your issues, but I think this is not a Calibre-related program. As far as I know, Calibre never starts any service when booting the computer. At least, it doesn't on mine.
Have you downloaded it from the Calibre website, or from somewhere else?
If you try to normally boot the computer, can you get into the desktop at some point, or isn't even that possible?
The only thing I could think of (if you don't have any restore points) is to press F8 during boot, and then choose "Last known good configuration". Then Windows will revert its registry to the point it was at when the system booted and shut down normally the last time.
If even that doesn't help, I think a reinstallation is the only option remaining; it will be faster (and cheaper) than trying to have the system fixed.
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