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#11
The ACTIVE flag identifies a partition as having an operating system on it that the system can boot at the BIOS level.
Now if you had multiple operating systems installed on different partitions/hard drives then when you started up your PC you would get the Boot Manager where you would be asked which operating system you would like to boot.
If you do not have multiple operating systems installed then the system does not know what to do with the ACTIVE partitions and in most cases these will be ignored by Windows when it starts up. This seems to be the case when there are 2 versions of Windows 7 installed. The system will pick one and ignore the other. The ignored partitions are usually the ones that do not get drive letters.
Now why drive G (with no Active Flag) is being ignored is a mystery to me. But it could very well be that the Active flag confusion is to blame.
Your 250GB SSD is Disk 6 above and it looks like it contains your Windows 7 installation and is Active. So it looks safe to assume that you correctly installed Windows on this drive with all the other drives disconnected. You want to test this by disconnecting all other hard drives, so only the SSD is installed, and see if you can boot into Windows. Report back if you cant.
Disk 3 is a 1TB WD drive that used to contain Windows (7?). It has a System Reserved partition (100MB). It is possible, if you installed Windows on the SSD while this drive was still connected, that the needed boot files are on this drive. If you removed the Active flag from this partition in that case then the system would not boot. That is why you need to do the test above.
If the SSD boots fine alone, and you have not deliberately installed multiple operating systems, then you do want to remove all of the ACTIVE flags except for the one on the SSD as Jumanji instructed.
Here is a graphical SevenForums tutorial to help with that chore:
Partition - Mark as Inactive
Also note that changing the Active flag will not affect the data on the drive(s).