If it used to work and now does no longer, something must have changed. One possibility is that someone got hold of your password, changed it (and the email address connected to it) and thus capered your website. The tools you mention make no particular attempt to encrypt your login data; anyone with access to your computer, physically or online, can steal them.

You can use the usual "password lost" routine at Network Solutions, via snail mail if the email address has been changed. You should then delete the whole contents and re-upload them, to make sure nothing has been infested.

All other possibilities I leave to the real experts to talk you through or thru.