Ok guys, Seeing almost no responses with solution, I decided to have a go and find out what exactly that 1GB is meant for....
Finally I have just now finished all the things perfectly....
1. I opened Paragon Partition Manager under normal Windows mode and formatted that 1GB partition to NTFS and set it to "Not Hide" and runned the process. After the process I saw a new drive in the explorer with 1GB. I just couldn't merge nor increase the size of this partition. Don't know what was it??
2. I opened Paragon Partition Manager under normal Windows mode and burnt a "Recovery Media Builder", which is nothing but a CD bootable Partition manager.
3. Then restarted the computer bootable with the same CD. Now I partitioned the C:\ Drive into 2 parts viz. 14.2GB system drive and remaining 50.1 GB to another partition.
4. Now I deleted the 1GB partition and further partitioned the 50.1GB drive to 2 more parts viz. 25GB and 26GB partitioned.
5. After restart, my HDD has a linear structure without any hidden drives nor any useless partitions. Here is a snap-shot after all this process....