This might be happening because Windows 10 Os already comes with an inbuilt Windows Defender, an inbuilt antivirus software provided with your installation of Windows by Microsoft to give basic protection to your PC.
As you told you already have ADWCleaner. It is bad idea to use multiple antivirus software. This is said by the official Kaspersky blog here https://blog.kaspersky.com/multiple-antivirus-programs-bad-idea/2670/
So you should disable Windows Defender if you are using ADWCleaner.
You can take help from this link to disable Windows Defender.
Once you are done with this let me know if you are still facing issues of computer restart.
Thanks & Regards,