Hi, I am Sandy and I look forward to help you today with the best answer possible.
I'm sorry about the issue.
I will work with you until it is fixed.
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What operating system is installed on the computer? Windows Xp/Vista/7/8/10
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Please hold down SHIFT and restart your computer.
Keep the SHIFT key down and the start tapping F8 key up and down many time and choose Safe mode.
If above provided steps does not help you, please tell me if you have very important data on the computer or it is already backed up?
Is it fine to restore it to factory settings?
This will delete all of the data and programs and files on the computer which you have already stored on it.