If both, Linux and Windows, are installed ("dual boot"), please observe the text messages while the computer is booting. There should be some point (for some seconds only) where you can choose which one of them to boot (press any key then to stop the pre-selection of Linux in your case).
Side-note: If you'd actually be able to boot into Windows without being asked for a password, this is a Windows version shortened on features, and being insecure.
After all, it appears reasonable to assume your laptop hasn't been delivered with a full operating system (freshly installed and with master-password).
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