Same reply as on this thread (
https://forum.avast.com/index.php?topic=200849.0 ). Please only post once per problem. Thanks.
Bruna51,
There is a malicious entry in your registry. Open regedit (press the Win key + the R key, then type regedit and press Enter), navigate to Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies and there should be an entry named "Shell" with value "explorer.exe,msiexec.exe /i
http://point....". Delete it.
Then run (via Win+R dialog) control schedtasks. Select "Task Scheduler Library" in the left panel. In the list in the middle select "PowerWord-SCT-JT" task and delete it.
Then reboot your computer.
Let me know if it worked.