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I don't quite know how it has happened, but the 12GB partition should not be allocated a drive letter, let alone drive letter C.
This partition is the computer's recovery partition and should not have a drive letter at all.
The 220GB partition holds the Windows OS and doesn't have a drive letter allocated, when in fact it should be allocated drive letter C.
Go into Disk Management and remove drive letter C from the 12GB partition, and then allocate it to the 220GB Windows partition.
This tutorial should help if you need it: Drive Letter - Add, Change, or Remove in Windows 7