Helping people with computers... one answer at a time.
It's not difficult at all to gain access to a used computer running Windows without knowing the password. You just don't want to.
I purchased a comp at garage sale but they did not know main password is there a way I can get this free. Hope I did not throw my money away.
I'll assume you mean the Windows login password.
I'll show you how you can bypass that and set your own - it's really not that hard.
And then I'll tell you why you really, REALLY, REALLY don't want to do what I suspect you're planning to do.
To clarify the situation, you've just picked up a used computer. The machine has some version of Microsoft Windows already installed on it, presumably belonging to the previous owner. It's asking you for a login password, and of course you don't know what that is.
To answer your immediate question: I can't get you the password, but you can set your own. This article will walk you through the steps to reset the administrator account and gain access to the entire Windows installation: I've lost the password to my Windows Administrator account, how do I get it back?
Having said that...
Don't do it!
Here's the problem: you have no idea what's on that machine.
Sure, it has Windows.
It could also have lots and lots of malware. The machine could be thoroughly infected with viruses and spyware.
And even with all the anti-malware tools in the world, there's simply no way to know - I mean really know - that the machine has been cleaned up.
The only practical thing to do, the only safe thing to do, is this:
Run a tool like DBAN to completely erase everything on the hard drive.
Reinstall Windows from scratch.
That means that either you'll have wanted to make sure to get the Windows installation media that came with the machine when you purchased it, or you should plan on purchasing a new copy of Windows to be installed on that machine. (If the cost is prohibitive you might also look into free alternatives like Ubuntu Linux.)
Do not rely on pre-installed Windows on a used machine. It's simply not safe.
Side Note: An Important Lesson
As I said, you don't know what's on that machine. It could have tons of illegal content on it, malware, or ... it could have sensitive data that the prior owner should have erased.
Don't be that prior owner.
When it comes time for you to dispose of a machine, make sure to completely erase the hard disk before getting rid of it. Too many machines found in flea markets, garage sales or on Craigslist accidentally have personal information that the prior owner simply "forgot" to remove.
Use DBAN before you get rid of your old machine.
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