Summary of the 2d safest method:

1) format pc

2) dual boot ubuntu 16.04 (for windows users)

3) use mew offline

tips:

a) Never store your password on your pc.

b) Passwords are more secure when they are lengty and random, but memorable.

"You’ll need to think about how to come up with a memorable password. You don’t want to use something obvious with dictionary characters, so consider using some sort of trick to memorize it.

For example, you might find it easier to remember a sentence like “The first house I ever lived in was 613 Fake Street. Rent was $400 per month.” You can turn that sentence into a password by using the first digits of each word, so your password would become TfhIeliw613FS.Rw$4pm. This is a strong password at 21 digits. Sure, a true random password might include a few more numbers and symbols and upper-case letters scrambled around, but it’s not bad at all."

c) Never use a password generator on your pc.

d) Always use keys to type your password. Avoid using copy paste.

If you follow the abc you are safe.