Go to search and type in Powershell. Once you see it make sure you select Run As Administrator.
Now to see a complete detailed list of Errors simply copy the code below and Paste into Powershell.
Get-WinEvent -FilterHashTable @{LogName = "Application", "System"; Level=1,2; StartTime=((Get-Date).AddDays(-7))} | Out-GridView
You will now get a detailed list of your Windows Errors with Description of the errors. Example Below..
This should help you better isolate what is causing your errors or at least enable you to better describe what is causing the problem for others to help you isolate and fix your problem.