Slow pc with Avast Free

I clicked the link in my last email and it brought me to your post when I was not logged in. I logged in and clicked the link again and it brought me to same point. This was done on my Desktop pc.

After following as instructed I got these results in ‘Event Viewer’.
Shutdown
29/06/2016 36358ms
30/06/2016 45157ms
01/07/2016 60467ms

Boot Performance
29/06/2016 157050ms
30/06/2016 157822ms
01/07/2016 133787ms

This application caused a delay in the system shutdown process
File Name taskhost.exe
Friendly NameHost Process for Windows Tasks
Version 6.1.7600.16385 (win7_rtm.090713-1255)
Total Time 853ms
Degradation Time 295ms
Incident Time (UTC)
2016‎-‎07‎-‎01T10:14:21.702967400Z

This application caused a delay in the system shutdown process:
File Namelsass.exe
Friendly NameLocal Security Authority Process
Version 6.1.7601.23455 (win7sp1_ldr.160516-0600)
Total Time 405ms
Degradation Time 244ms
Incident Time (UTC)
2016‎-‎06‎-‎28T20:59:36.365060700Z

After running Avastclear.exe these were still on my pc.