If you use tools like BitLocker, PGP and TrueCrypt, you need to read this

Why? As this article shows:

In summary, files encrypted with BitLocker, PGP and Truecrypt are safe from this product as long as volumes are opened or mounted and then closed and demounted in an orderly way; doing this destroys the insecure memory dump. For extra safety, hibernation should be disabled.

In other words, to be safe, prevent as little as possible from being left hanging out in memory.

Taken from BitLocker, PGP and TrueCrypt encryption weakened by new attack tool – Techworld.com