To resize partition in Windows without data loss, you can resort to the professional partition magic MiniTool Partition Wizard. To perform other partition management in Windows, you can also turn to this partition magic.

1. Professional Partition Magic helps
Resize Partition without Data Loss
Among all partition magic, there is an excellent one which is able to resize partition in
Windows perfectly. It is called MiniTool Partition Wizard.
This partition magic is developed and released by the famous software development
company MiniTool Solution Ltd.. After unceasing upgrade and update, its functions are
much more powerful than those of other similar products. At the same time, this company
aims at serving the public, so it provides home and individual users with free data
recovery software and free partition magic. Moreover, all products of MiniTool brand
support all commonly seen 32 bit and 64 bit Windows PC operating systems and
Windows Server operating systems, such as Windows NT, Windows 2000, Windows XP,
Windows Vista, Windows 7, Windows 8, Windows Server 2008, and Windows Server
2012.
--Source from
http://www.partitionwizard.com/resizepartition/windows-resize-partition-safely.
html
How to resize partition in Windows?
Many users would want to know how to resize partition in Windows by using this partition
magic. The following introduction will show users detailed operating steps. However, if
users want to use this partition magic, they should own it at first. Now, visit the official
website http://www.partitionwizard.com to download the professional partition magic. After
installing it to computer, users can start it to resize partition in Windows.

2. After running the partition magic successfully, we can see the interface above, where all
partitions on the computer will be displayed. Here, we take extending partition C for
example. If there is unallocated space adjacent to partition C, users need to select
partition C and choose the function “Move/Resize” in toolbar. Then, the following interface
will appear:

3. In this interface, users need to drag triangles on both sides of partition handle to lengthen
partition handle so as to extend partition C. Of course, users can input exact value to the
textbox of “Partition Size” to extend partition C. After that, click “OK” button to go back to
the main interface where preview effect is shown. If the preview effect is desired, users
should click “Apply” button in toolbar to apply all changes to computer. After this operation,
the work to resize partition in Windows will be finished by professional partition magic.