There is an obvious problem with Comodo AntiVirus

After I had installed Comodo AntiVirus onto my notebook, I failed to save anything onto the SD card. The Windows just automatically closed down when I clicked “save”, and I could only cut the power supply in order to shut down the notebook. I even failed to shut it down by proper means because the whole Windows had closed down.
After I had uninstalled it, everything returned to normal. Now PC Tools AntiVirus has been installed and no any problem arises.
What is wrong with Comodo AntiVirus? Is PC Tools AntiVirus (which is recognised by the Windows security center) better than Comodo AntiVirus (which is not recognised by the Windows security center)?

Hi Matthew,

since you have posted the same question here:

I will lock this topic. I am sure someone will answer your question.

Please do not post the same topic in more than one place as it makes it harder for you to find out where all the responses are, harder for everyone else to find their way around the board and things can become confused.