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After installing the latest update KB3000850, Avast users reported having problems with Windows 8.1.
The latest update includes new features and improvements.
- More language packs for 8.1
- Defence-in-depth security and Schannel hardening
- Improved Web Services for Devices (WSD) printer support during network switches
- Performance and reliability improvements in clustered virtual machine mission-critical environments
- Additional support for hardware such as devices that have third-party disk encryption software enabled can now be upgraded to Windows 8.1 easily.
- More manageable
- Added support for more hardware (SD card improvements, USB debugging, boot order allowance)
The typical symptoms are
- PC becoming non-responsive after restart
- Apps not opening up properly
- In some cases, the computer is not even able to boot to desktop
- Operating system itself is sluggish
Note: This problem is reported only by some Avast users, but most of them don’t have a problem after upgrading to Windows 8.1.
- Uninstall Avast security software
- If you are unable to boot to desktop for removing Avast, try to boot in safe mode which works fine. You can disable the Avast services from running in this mode.
- Once Avast is removed, restart computer and check if the problem is fixed.
- If the problem is fixed, do not try to re-install Avast. At the time of writing, Avast have not come up with a solution. They will be releasing an update or patch very soon which should make it work. Till an official announcement, do not install Avast.
Hope this article helped fixing your problem.