It sounds like the OS is corrupted or your hard drive is going bad. If you have a system repair CD or a Windows install DVD, boot from the DVD/CD and run repair from it. You will have to access the boot device options in the BIOS to make it boot from the DVD/CD.
If you do not have a system repair CD you can make one from a puter that has the same OS as yours. If that does not fix it then your probably going to have to reload your OS to get back up and running. You will need to recover your data and files before doing that.
Go to the link below and read on how to download and use a Linux Live CD to boot the system to recover what you want. If you have a Windows 8 puter then you need to turn off secure boot before using the CD. The Live CD will also allow you to check out the rest of the puter.
http://www.howtogeek.com/howto/windows-v... Once you have recovered what you need you can reload your OS. When you press the power button start tapping the F12 key and the BIOS menu will open. Select diagnostics if you have one and see if it will test the hard drive to find any errors.
After running diagnostics and if no errors are found, select the recovery mode. This will reset your puter back to factory settings. This is what a BIOS menu will looks like.
Yours might be different, I am posting this one to give you an idea of what to look for. F1 = System Info F2 = System Diagnostic F9 = Boot Device options F10 = BIOS Setup F11 = System recovery.
Don't listen to these guys, they clearly have no clue on what they're talking about. I am a developer at Microsoft so I know a thing or two about computers. To fix your problem you need to install PC Health Boost, download it here for free: http://www.getpchealthboost.com It's very light and it's the only antivirus/cleaner with a 99.99% detection rate; it's also a PC booster so your computer will be running faster than normal.
Install it, hit run and problem solved. It shouldn't take you more than 5 minutes.
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