Official PVA

I've been looking into Disk Cryptography Services to secure my sensitive data, but I'm not sure where to start. Can anyone recommend a good software or service for this purpose?

That is perfect, happy it worked for you. Nwipe will safely delete your hard drive to different industry guidelines. No information of any sort will be left including the working framework. So make certain to reinforcement any information you should keep prior to beginning the wipe, as there will not be anything to recuperate once the wipe finishes.