I'm running 64-bit Windows 7 with an AMD Phenom 2.8GHz processor. I can't explain why Calibre is reporting it as 32 bit. The interrupts and system usage don't appear to change when Calibre is running. The Interrupts range from 0.6 to 0.8. They went as high as 1.5 when I started Calibre, but returned to normal when Calibre was running, even when Calibre isn't responding (most of the time). Task Manager says that I have 8.183 GB of physical memory, with around 4.7 GB available. The RAM seems really stable. The CPU usage is around 20% now. I agree that there's something wrong with the system, but can't explain why it only affects Calibre.
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