If your machine is from a large PC company, then your copy of Windows 7 is supplied, installed, activated and supported by that manufacturer, and not by Microsoft. If the hard drive is decaying, this might no longer be possible. I expect that the PC manufacturer also prompted you from time to time to create restore discs on DVD or on an external hard drive, so I hope you did that. Today, Windows 7 machines typically come with a hidden "restore partition" that will return the PC to its factory condition. This will assess the health of your hard drive. To see if it is the latter, run the free diagnostic utility, HDD Scan. In this case, it sounds as though you either have a particularly bad virus infestation, with multiple types of malware, or the hard drive really is failing, and needs to be replaced. Microsoft has a trouble-shooting guide, Resolving stop (blue screen) errors in Windows 7, that could help you isolate the specific problem.
You can save the free version to your desktop and run a Quick Scan. However, both viruses and anti-virus programs can cause BSODs, so it's important to check for rootkits using GMER and to run a good checker such as Malwarebytes Anti-Malware (MBAM). The most common ones are bugs in video graphics drivers, and faulty hardware, such as memory chips that are not correctly seated or have gone bad. Blue screen problems can be hard to resolve because there are so many possible causes. It's fairly unusual to get a "blue screen of death" (BSOD) or, correctly, a Stop Screen on Microsoft Windows 7, but the screen should provide some indication of what went wrong. I believe that the hard disk is failing and I want to replace it, but I am worried that I will need to re-register my 64-bit Windows 7 licence and that Microsoft will see this as illegal, duplicate use of the licence. Chkdsk sometimes runs on boot up, and often reports lost files. Most of my user accounts have disappeared, leaving me with just one account that has child protection turned on, making some applications inaccessible and blocking access to the user accounts section in the control panel. I frequently get a "blue screen of death" and the computer reboots. My computer has suddenly become very unreliable.
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