Q: can't retrieve music and have to use password everytime I open iTunes library

I bought a new laptop about a year ago and was able to move all my music without a problem.

Now a year later, all my music gets a "can't retrieve file" message, so when I find it and check "try to find the other files in the same location" iTunes freezes every time.

I really don't want to have to move all my music again!

Also, I have to sign in every time I open my library, which is just incredibly annoying!