As long as it’s the regular Windows password, you can often press F8 repeatedly on startup, start it in safe mode, and there’s often a hidden Administrator account.
You can go into that and then actually strip out the password for the other user. But in order not to create waves, it might be better just to go in and find the data file you want without stripping the main user password, and make a copy of it.
If that fails (no hidden Administrator account or it’s passworded with an unknown password) there are utilities you can find out there on the web that will allow you to create a boot disk that will allow you to strip the main password.
You can always reset the password to ‘bitch’ :O)