How do I convert my C: drive to GPT?

in all the tutorial videos I've seen the method is to delete everything in the drive then convert, but my windows is installed on this drive and deleting my OS will not let me complete part 2 (converting to GPT).

(NOTE) all my Data is Backed up on a different drive so data loss isnt a concern AND this other drive also has 150GB left
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  1. why do you want to? can windows even be installed on gpt? many versions won't let you.
  2. 13thmonkey said:
    why do you want to? can windows even be installed on gpt? many versions won't let you.


    I have windows 8 and a Motherboard with a UEFI BIOS. it definitely supports it
  3. you are changing the fundemental structure of the hdd, you'll lose the data, backup and restore, although windows may not like being changed.
  4. 13thmonkey said:
    you are changing the fundemental structure of the hdd, you'll lose the data, backup and restore, although windows may not like being changed.


    i know that, and all my data is backed up waiting to be copied and pasted to my newly converted GPT drive
  5. so when you install the new copy of windows you need to format the drive etc. and chose the gpt disk.
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