PC-Doctor is a genuine process, as we have mentioned it is a part of Dell SupportAssist, so, there is no way it is a virus. However, there are chances that a virus can masquerade PC Doctor and eat a lot of resources. If you want to confirm, right-click on PC-Doctor Module, and click Open File Location. In case, your location is anything different from the following, then we have a problem.
C:Program FilesDellSupportAssistAgentPCDrSupportAssist6.0.7193.611pcdrmemory2.p5x" run -e -lang en -cust dell -var dsc -bd "C:ProgramDataPCDr7193" -engineClientPid
If you conclude that PC-Doctor Module is a virus, then try using your antivirus to scan your system. You can also use Windows Defender to scan your system.
Following are the steps to use Windows Defender.
Search out "Windows Security" from the Start Menu.
Go to Virus & threat protection > Scan options.
Click on Microsoft Defender Offline scan > Scan now.
Let it scan and resolve the issue for you.