Your best bet is to try and boot into safe mode. You need to tell us what version of windows you have before I can instruct you on that.
If you can get into safe mode, Download [https://www.malwarebytes.com/|Malwarebytes] and do a virus scan of your computer.
If it comes out clean or removed viruses, reboot and try normal boot. If that still doesn't work boot back into safe mode and start uninstalling any programs that you do not know what they are or ones that look strange.
To uninstall a program, go into control pannel and then navigate to Unintall Programs. Then you can go and uninstall programs.
Once again, if you tell us what version of windows, I can get you instructions on how to boot into safe mode and how to get to the Uninstall programs.
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After doing that, if it still doesnt work. Boot back into safe mode and copy any important files or pictures or anything that you want to save and then do a Factory reset of windows (which i can instruct you on once you tell us version)
Your best bet is to try and boot into safe mode. You need to tell us what version of windows you have before I can instruct you on that.
If you can get into safe mode, Download [https://www.malwarebytes.com/|Malwarebytes] and do a virus scan of your computer.
If it comes out clean or removed viruses, reboot and try normal boot. If that still doesn't work boot back into safe mode and start uninstalling any programs that you do not know what they are or ones that look strange.
To uninstall a program, go into control pannel and then navigate to Unintall Programs. Then you can go and uninstall programs.
Once again, if you tell us what version of windows, I can get you instructions on how to boot into safe mode and how to get to the Uninstall programs.