I just did, and it doesn’t help

Well, Ad-aware and clamwin are fine programs that never gave me any problem while avast did. If I have to get rid of one, it’s the latter.

What does it means?

Also, I identified what triggers the computer freezing: it’s - you will never believe it - selecting a text with the cursor. For some reason, if the computer starts with avast activated, then selecting a text is not a problem (which is normal), if the computer starts with avast activated, then selecting just a character from a browser blocks it to the extent I described, without anythink noticeable on the task manager. Also, there’s a difference in selecting a text with a font attached, like an ordinary page, or a text without font like a redaction of a post in this forum, which causes about half of this effect. In both cases, however, the only solution is forcefully reboot. Do you know what on hell causes that?