If you are running Windows then go t the Task Manager (press Ctrl, Alt, Del and choose Task Manager) and look at the processes and applications. In Windows 10 you will get a detailed list and can see what is using a lot of CPU % or Disk writing. Usually writing to disk will slow a computer a lot. If you have an app that is using a lot of resources, that may be the issue and you may need to uninstall it.
A bad hard drive that is failing or has errors will also slow the computer and make it erratic. In Windows, right click on the Windows icon in the lower left corner, then choose Command Prompt (admin). A small black window should open. It will say C:/windows/system32> Carefully type (with no spaces) chkdsk/r and hit enter. It will say that this command can't be executed and ask it you want to schedule it to run on the next reboot. type Y for yes and hit enter. Then close applications and reboot your computer.
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This will test the C: drive for errors and recover data and fix the errors if possible. However, it may not fix a drive that is just failing which will start acting bad again. In that case you need to replace the HD. You need a copy of Windows or a Windows repair disk and internet access. You will also have to reinstall your programs and back up any pictures, music, etc. you want to keep for the new HD.
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This will test the C: drive for errors and recover data and fix the errors if possible.
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After testing this on my SSD (solid state drive) I would not recommend it for use on SSDs. It is much more likely to have a problem with the normal hard drives anyway and chkdsk may help.
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However, it may not fix a drive that is just failing which will start acting bad again. In that case you need to replace the HD. You need a copy of Windows or a Windows repair disk and internet access. You will also have to reinstall your programs and back up any pictures, music, etc. you want to keep for the new HD.
If you are running Windows then go t the Task Manager (press Ctrl, Alt, Del and choose Task Manager) and look at the processes and applications. In Windows 10 you will get a detailed list and can see what is using a lot of CPU % or Disk writing. Usually writing to disk will slow a computer a lot. If you have an app that is using a lot of resources, that may be the issue and you may need to uninstall it.
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A bad hard drive that is failing or has errors will also slow the computer and make it erratic. In Windows, right click on the Windows icon in the lower left corner, then choose Command Prompt (admin). A small black window should open. It will say C:/windows/system32> Carefully type (with no spaces) chkdsk/r and hit enter. It will say that this command can't be executed and ask it you want to schedule it to run on the next reboot. type Y for yes and hit enter. Then close applications and reboot your computer.
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This will test the C: drive for errors and recover data and fix the errors if possible. However, it may not fix a drive that is just failing which will start acting bad again. In that case you need to replace the HD. You need a copy of Windows or a Windows repair disk and internet access. You will also have to reinstall your programs and back up any pictures, music, etc. you want to keep for the new HD.
If you are running Windows then go t the Task Manager (press Ctrl, Alt, Del and choose Task Manager) and look at the processes and applications. In Windows 10 you will get a detailed list and can see what is using a lot of CPU % or Disk writing. Usually writing to disk will slow a computer a lot. If you have an app that is using a lot of resources, that may be the issue and you may need to uninstall it.
Iolo system Mechanic may also help.