Please go here and complete all steps as requested. Post back here with the requested logs.

May I inquire as to WHY you removed Avast? You have to have an onboard anti-virus program running at all times for protection. You also are not running a firewall, another must have today.

We need more information on the computer itself...hard drive size, how much RAM is installed.

Why did you do a quick format? Only use this option if your hard disk has been previously formatted and you are sure that your hard disk is not damaged.