unable to get secured sites (Https) on the internet. is avast the cause
Most probably not. avast web shield can’t scan https traffic (as it is encrypted).
Which is your firewall? Browser (and addons/extensions)?
Have (or did) you another Anti-Virus installed in this system, if so what was it and how did you get rid of it ?
computer now fixed. thanks
How it was fixed, would close the topic off nicely and may help outers in the future ;D