OS 10.6 requires an Intel processor. OS 10.7 requires a Core 2 Duo, i3, i5, i7, or Xenon processor. You cannot install OS 10.7 ("Lion") on a Core Duo processor system.
The earliest MacBook Pros had a Core Duo processor. For those early MacBook Pros, you can install OS 10.6, but not OS 10.7. {{To "upgrade" your system to Lion, you must be using OS 10.6.6. Using a bootable disk with the Lion installer, such as the Apple USB Install Disk, you CAN install Lion on a HDD that has no OS at all (not an "upgrade"), but the system processor requirements are still just as I say above.
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