|I'm sorry the situation is not clear... When you say it will not accept my password when I switch on - when is this password requested?|
There are two places where a password can be required. The first is not often used - and it happens almost as soon as you power up - on a black screen with a small (usually black/while) dialogue box - requesting only a password; no user name.
Later - and this is the more common one - when windows has booted up almost fully you get a dialogue box requesting both your user-name and password to actually login to your windows account and desktop
So which is it?
In your #6 you say Vista touch screen. Are you saying you get to the Vista logon (your user-account) and then the touch screen doesn't accept your password? If so then what happens if you do it all with the keyboard and use "Return/Enter" on the keyboard, or the mouse to click OK?
And have you tried to logon via Safe-mode?