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#50
Hello Ramesh,
If you do not want the D: partition, then you could delete the D: partition so it will be unallocated space. Afterwards, extend C: into the unallocated space using Disk Management.
If you wanted to keep the D: partiton, then yes you will need to use a program like Partition Manager to shrink D and extend C into the space you shrunk from D: .
Hope this helps,
Shawn