I have a accer aspire laptop, i have 2 hard drives on the computer... accer (c) and acer (d)?

the computer is only using C drive and D drive is sitting there doing nothing, i want to combine the 2 drives so that i just have one big hard drive, how do i do this? preferably frr of charge
Update: thanks to Tom, i have managed to erase (d) drive, i now have 56gb unallocated space, how woild i allocate this space to (C) drive?
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