This thread has made me think. Can I advise that if you have to send your computer in for repair you familiarise yourself with where the password manager is for your sites and remove them all before you let it go in?

In Chrome it is in the three lines at the top right hand corner, then settings, then show advanced settings and Passwords and Forms under managed saved passwords.
In IE (well IE10) it is under the cog wheel then internet options and in the general tab, the one it should open on, under browsing history click delete and make sure saved passwords is ticked then click delete to get rid of them all.