Avast firewall blocks AvastSvc?

[REDACTED]

Help please.  I  have read through the past few days to see if this is a problem for other users.  After current Windows updates, system running very slow.   Several processes gobbling up cpu, so I did a repair of Avast.   Big mistake.  Now Avast doesn't even run.
I like many others who have posted about the WM I issue is the reason I used the repair feature.
Issues always seem to a rise when Avast updates the program version.   I am a 6 year user of Avast... but I  can't believe we are always told the same things as a fix.
This program update is the worst!  This is my 2nd posting since new update.  If anyone can help me get my PC running right again please.

[Eddy]

Perform a clean installation of the latest version (2015.10.2.2214) and see if the problem is solved.
It is known that a update sometimes is causing problems.

[essexboy]

  After current Windows updates, system running very slow.   Several processes gobbling up cpu, so I did a repair of Avast.   Big mistake.  Now Avast doesn't even run.
I like many others who have posted about the WM I issue is the reason I used the repair feature.

Could it be a windows update problem

[REDACTED]

  After current Windows updates, system running very slow.   Several processes gobbling up cpu, so I did a repair of Avast.   Big mistake.  Now Avast doesn't even run.
I like many others who have posted about the WM I issue is the reason I used the repair feature.

Could it be a windows update problem

I am checking all that right now in safe mode.   All updates looking fine.  Interesting what I did  find.   When I did the repair, it now shows my Avast It says it now has  5 users.   Prior to this there were only 3.  One of the 2 extras is myself (as standalone w/o administrative permission.)  So it (avast) won't allow me to even open the program tto attempt and do the normal fixes
Help

[essexboy]

Uninstall and then re-install Avast

Download Avast Uninstall Utility to your Desktop.
Download the correct version of Avast 
Avast Free
Avast Pro
Avast Internet Security
Avast Premier
Disconnect from the net
Uninstall Avast via control panel

• Run the uninstall tool and accept the reboot to safe mode
• Once complete reboot your system
• Reinstall Avast

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[REDACTED]

Doing as you said... but since my cpu is running this strange avast at break neck speed, it's going to take me 45 minutes to download Avast IT Security. 
I am gonna blow a fan out on my system at this rate.   

[essexboy]

Download the tool in safe mode with networking

[REDACTED]

Well now this is a new one.  Avast won't uninstall?   Now what?

[Eddy]

How are you trying to uninstall ?
If you are getting a error message, what does it say ?

[REDACTED]

Attempting to uninstall.  No error msg.  Just the opposite.   Doing as directed by Essex boy ( I have done this process many times  before ).  I  have no clue
.

[REDACTED]

HELP.  Avast will not uninstall.  HELP!

[REDACTED]

Finally, I reversed the procedure and Avast is gone.   Now I just need to figure out why my modem shows connection to my network... but it's not
I am beginning to really be annoyed with Avast

[REDACTED]

OK another day.  Next step to do a clean install.  The Avast IT Security I downloaded exactly as you instructed.  To be on the safe side and to correct the issue permanently, I  am checking to be sure this is a valid Avast program.
Logged on in safe mode and looking at the execution file.  It says under the general tab at the bottom that " this file came from another computer and might be blocked to help protect this computer ".  My question:  is this normal?  Don't want more issues. 

[essexboy]

If you used my link it is direct from the Avast servers

[REDACTED]

If you used my link it is direct from the Avast servers

Yes I definitely used your link.  You are the most effective help on these forums!  I think... we are doing fine.  However, the problem others are having with spiking of the CPU usage every 20-30 seconds because of the WMI process, is happening here too.
I'll let it rest until tomorrow, then I will run another Malwarebytes test , a full virus scan and also a spyware utility from bleepingcomputers.com.
Thank you again so much.  Not even sure what was causing the most distressing issue, but seems to be resolves.