Prompt for missing Svchost.exe when starting the system

Q: I am using Windows XP. Recently, I have a problem. When I start the computer to log in to the system, it takes a long time to enter the system after entering the administrator password. Then the system prompts that it is in C:\\Windows. There is a file named Svchost.exe missing from the folder. I did not find this file when I searched the system. What should I do at this time?
A: The system prompts the lack of Svchost.exe file, indicating that your computer is infected with a virus. The solution is as follows.
1. Click “Start →Run”, then type msconfig and press Enter to open the System Configuration Utility.
2. Select the "Start" tag, find the option with the reg in the command, and then clear the previous check box.
3. Click the “OK” button to save and use the latest anti-virus software to perform anti-virus operations.