How to fix Comodo Antivirus Error 1603?

The error 1603 occurs when the Comodo antivirus program fails or crashes during runtime. Some of the causes of this error code are incompatible programs, memory problems, a bad graphics driver, and virus infections. Below are the troubleshooting steps to resolve the Comodo antivirus error 1603 on a Windows computer.

Comodo Antivirus Error 1603

Step 1 - Incompatible programs

  • Hold the Ctrl, Alt, Del keys together on the keyboard to open the Task Manager window.
  • Navigate to the Processes tab and then stop the running programs one by one to identify the incompatible program.
  • Note: To stop the program, you have to select it and click the End Process button.
  • Once you find out the conflicting or incompatible program, uninstall it by following the quick instructions provided here.
  • Open the Control Panel window and click the Uninstall a program option.
  • Select the conflicting program, click Uninstall, and proceed with the on-screen steps to completely remove the conflicting program from the computer.
  • If needed, you can re-install the program after resolving the Comodo Antivirus Error 1603 .

Step 2 - Virus protection program

  • Update your antivirus program whenever an update is available. If the antivirus program is outdated, it will not detect the latest threats.
  • To protect the computer from all the threats, you have to keep your antivirus program updated.

Step 3 - Runtime libraries

  • Navigate to Programs and Features, search for the current Microsoft Visual C++ Redistributable package, and select it.
  • Click the Uninstall option located at the top of the programs list.
  • Once done with uninstalling the selected program, reboot the computer.
  • Visit the Microsoft website, download the most recent version of the Redistributable package, and install it on the computer.

Step 4 - Disk cleanup

  • Backup your files and then free up some space on your hard drive.
  • If required, clear your cache and restart the computer.
  • Launch File Explorer, right-click your directory, and select the Properties option.
  • Click the Disk Cleanup option.

Step 5 - Graphics driver

  • Search for your graphics driver in the Device Manager window and right-click it.
  • Select the Uninstall option.
  • After uninstalling the graphics driver, restart the computer.

Step 6 - Internet Explorer

Browser reset

  • Type ‘Internet Options’ in the Windows search bar and select the same.
  • Navigate to the Advanced tab and then click the Reset option.

Disabling script debugging

  • Select the radio button next to the ‘Disable script debugging’ option.
  • Deselect the ‘Display a Notification about every Script Error’ option, click Apply -> OK, and restart the computer.
  • If the Comodo antivirus error 1603 persists, you can get help from our technical experts.