Forgot my sceen name and pasword carl davis lampasas tx

If your hard disk crashed you cant do anything but other issue
after repair done you can put windows to safe mode on windows 7 by pressing F8 key when you see the fist dos screen it will show you option to login as built in Administrator account with out password you can login to windows

Computer experts usually have software that can bypass or reset your password on your computer. Even Best Buy's Geek Squad could do it. It's usually simple and fairly cheap as long as you didn't use an encryption scheme.
If it's websites you're trying to get into, usually you can put in your email address and receive an email to change your password when you don't remember it.
If you've changed e-mail and never updated it on the website, you still might have a chance, your old e-mail could be available a year or more after you quit using it.