Harry,
I was thinking of updating to Windows 10 and just looked at encryption software and read this :
Might be helpful
TrueCrypt and Its Derivatives
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Spending another $99 just to encrypt your hard drive for some additional security can be a tough sell when modern Windows PCs often only cost a few hundred bucks in the first place. You don’t have to pay the extra money for encryption because BitLocker isn’t the only option. BitLocker is the most integrated, well-supported option — but there are other encryption tools you can use.
TrueCrypt — an open-source full-disk encryption tool — still works with Windows 10 and is still an option. There are also other full-disk encryption tools based on TrueCrypt. These are free, open-source encryption tools you can install on Windows 10 Home or previous versions of Windows to encrypt your hard drive if you don’t have access to BitLocker. Unfortunately, TrueCrypt might require some fiddling if you have a modern PC. But, if you have a Windows 7-era PC you’ve upgraded to Windows 10, it may just work.
Yes, TrueCrypt’s developers did famously shut down development and declare TrueCrypt vulnerable and unsafe to use, but the jury is still out in the security community on whether it actually is vulnerable or not. More importantly, much of the discussion around this centers on whether the NSA and other security agencies have a way to crack TrueCrypt encryption. If you’re just encrypting your hard drive so thieves can’t access your personal files if they steal your laptop, you don’t have to worry about this. TrueCrypt should be more than secure enough.
We’d like to see Microsoft give more Windows 10 users access to BitLocker — or at least extend Device Encryption so it can be enabled on more PCs. Modern Windows computers should have built-in encryption tools, just like all other modern consumer operating systems do. Windows 10 users shouldn’t have to pay extra or hunt down third-party software to protect their important data if their laptops are ever misplaced or stolen..