Lots of Advice, but maybe start here
It seems to me that no one mentions that this seems to be a computer that was working just fine recently, and now it doesn't. So it's possible but unlikely that, for example, the BIOS boot sequence changed somehow. I would go into the BIOS setup (F1, F2, Delete, or whatever key is suggested on the startup screen), and look to see if the hard drive is being recognized as a device. If not, then it's quite likely its power or signal cable has vibrated loose, and just opening the case and pressing all the connectors to make sure they are seated may be all it takes.
After that, a cable or connector, or the hard drive itself, or even the motherboard could have failed. This is a job for a computer tech to deal with.
On the other hand, if the computer boots correctly and the problem occurs while Windows is trying to load, then something more serious has gone wrong. In this case, I would advise against most* of the advice being given about repair installs, creating and loading an alternate OS, etc, because (with all due respect to Gwen) if she could execute them safely, she should already have enough computer knowledge to give a more precise problem description than she did. Get your machine to an expert.
* except: press F8 repeatedly as windows is starting, and see if you can get into SAFE mode. Sometimes just successfully starting up in Safe mode and then shutting down fixes a quirky problem.
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