AVAST STOPPED WORKING

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UI Failed to Load" this error accrued suddenly, I think avast auto-updated last night since installed date at "programs and feature" shows 26/5/2017, I used the repair option and restarted the PC but it was not solved, I tried to update it responded "RPC server is not responding". I have been using avast free antivirus for more than 4 years and this is the first time I face such a problem!

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when I double click on the avast shortcut this message is shown

[Asyn]

- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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Windows 10 64
first antivirus used
only windows defender is also found

[Asyn]

1. Download Avast Free Antivirus: https://files.avast.com/iavs9x/avast_free_antivirus_setup_offline.exe
2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.

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Also, when you see that screen about the service not started it is an Avast thing; it takes it's time.  Several clients reported this to me and I just tell them to click the "Restart the Service button and then go get coffee, make eggs, toast and bacon.  100% of the time when they get back it's happy again.  With several SSD's this takes about 1 minute or less, with regular hard drives it can 5-10 minutes.

If it does not start after those 10 minutes then do as prescribed, uninstall, clean, then re-install.  You will still get it, but it should start up again.

I have 39 computers to watch and maintain and some of those have Avast.  Yes, this happens also with big updates to Avast, but it will start again.