I had 3 partitions (C, D and E) on my hard drive and wanted to eliminate the 3rd one because it served no purpose and I needed more room in my 2nd partition. I thought that by eliminating the 3rd partition, it would open or give the memory to the 2nd partition but it didn't do that. It only made it inaccessible.
Any data in the partitions will be lost when they're merged so it has to be saved somewhere else first.
Since my E drive was inaccessible because I had already deleted it. I saved the data that was in partition D to another drive.
The next step was to delete partition D.
The next step is to right click on one of the partitions and click on "Make Logical Drive." It'll tell you how much free memory is available on the drive, click "OK" and the two partitions are merged.
I now have 2 partitions that are accessible. My C partition remained intact since it wasn't involved. My D partition now contains all of the memory that was in both partitions.
I want to spread this information around as much as possible because it's the solution that Windows created and programs such as Partition Magic are making a fortune off of people not knowing it.