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#21
"Boot" is another listing like Active, Primary etc which tells us in PW that it is the partition holding the boot files and actively booting Win7. In Disk Mgmt it is called "System," while "Boot" is the presently booted partition - in PW "System" is the presently booted partition, which you don't have since Win7 is not booted.
All you need to do is ask back for these questions rather than frustrate yourself searching for any other than simple definitions. This is the top tech site on the web (ever) so you can find out pretty much everything you want to know here. Most of the repair and install regimens for Win7 were developed here in beta.
It is strange that in BIOS setup the same HD listed as first HD to boot is also "excluded" which is an unusual settiing and may be the problem. What choices do you get when you arrow down to either of those HD listings and press Enter?
Check also on the Advanced BIOS tab for more HD listings. If both HD's are not available for selection under BIOS Boot Priority order, it is normally because one is already selected as first to boot HD elsewhere under Storage, SATA or other devices.
If you don't have another Win7 machine of the same bit version to burn a Repair CD, then easiest is to burn the latest official ISO file for your licensed version of Win7 to DVd or flash stick using the tool provided in Step 6 of Troubleshooting Windows 7 Failure to Start. MS in their wisdom restricts the Repair CD download more than the actual OS download, so it is only licensed to be sold by EasyBCD online.