That's my view of it. By wiping the drive, I mean cleaning it up to receive a new installation. Do you have a DVD with 8.1 Professional on it?
You will need to buy one because the licence you have now won't transfer to another version. Install it - it will clean the disk as it goes on with the installation - and before July 29th you'll be able to go one step further and upgrade to Windows 10.
It's a lot of work, not to mention money. What are the requirements of the works network that expects you to have the high-end version of Windows?