This procedure is only needed if your VPS disk did not auto-extend. You can follow the first two steps below to check. If you don’t have a large amount of "Unallocated" space then these procedures are unneeded.
Go to [Start Menu] > [Computer Management].
Go to [Disk Management]. Notice you have [Unallocated space] for your disk.
Right click on the [C:] drive and choose [Extend Volume].
Click [Next]. Note: The [Select the amount of Space in MB:] should match the [Maximum available space in MB:] to utilize all the unallocated disk space.
Done. You have extended the disk to utilize all available disk space.