Because you have many areas to explore which you'll soon discover. There is no single place to look or one cause. For this I always check out if my spare Local Admin account is showing this because that would be a sign I need to run an antivirus and malware scan. So let's get into the work.
1. Always have a spare Local Admin account. Here's a link on how for those that need it.
https://www.howtogeek.com/226540/how-to-create-a-new-local-user-account-in-windows-10/
2. Look at AUTORUNS report. The app is from Microsoft at https://docs.microsoft.com/en-us/sysinternals/downloads/autoruns
You want to see what items are calling up cmd.exe and do not make the mistake of wiping them all out. You are looking for the one. Will take practice.
when I open the computer it sends me to the C:\Windows\system32\cmd.exe
what should I do for my computer to work pls could u tell me.

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