There are numerous password crackers for the various Windows operating systems. Some are easier to use than others. I would seriously consider FIRST gaining physical access to the computer and securing it. In other words, put it where it can’t be accessed by unauthorized persons. I personally like post # 42.
“There are numerous password crackers for the various Windows operating systems.”
I’ve never gotten any of them to work. On the other hand, UBCD4Win is a RAM-based operating system that includes elements of XP, and its password tool simply modifies the SAM hive file to replace whatever password exists with no password. This has ALWAYS worked for me.