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On older Windows operating systems, if you could boot on alternate media (a floppy, USB, or CD/DVD), you can boot a utility to mount the Windows hard drive, modify the administrator and other passwords (or blank it out), then reboot so you can get in.

A few things could prevent you from doing this:

--BIOS settings that don't boot on alternate media first, combined with a password or other restrictions on BIOS that prevent you from changing the boot order

--Encryption of the Windows boot drive. For example, Checkpoint Pointsec tool makes the boot drive appear to only have a 1 meg partition and prevents using anything but a Checkpoint utility to read the drive.

The history of the modern computer begins with two separate technologies, automated calculation and programmability, but no single device can be identified as the earliest computer, partly because of the inconsistent application of that term. A few devices are worth mentioning though, like some mechanical aids to computing, which were very successful and survived for centuries until the advent of the electronic calculator, like the Sumerian abacus, designed around 2500 BC[4] of which a descendant won a speed competition against a modern desk calculating machine in Japan in 1946,[5] the slide rules, invented in the 1620s, which were carried on five Apollo space missions, including to the moon[6] and arguably the astrolabe and the Antikythera mechanism, an ancient astronomical computer built by the Greeks around 80 BC.[7] The Greek mathematician Hero of Alexandria (c. 10–70 AD) built a mechanical theater which performed a play lasting 10 minutes and was operated by a complex system of ropes and drums that might be considered to be a means of deciding which parts of the mechanism performed which actions and when.[8] This is the essence of programmability.

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Modern computers based on integrated circuits are millions to billions of times more capable than the early machines, and occupy a fraction of the space. Simple computers are small enough to fit into mobile devices, and mobile computers can be powered by small batteries. Personal computers in their various forms are icons of the Information Age and are what most people think of as "computers". However, the embedded computers found in many devices from MP3 players to fighter aircraft and from toys to industrial robots are the most numerous.hundred modern personal computers (PCs).In this era mechanical analog computers were used for military applications.

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Try booting it up in safe mode

Try booting it up in safe mode