Why? ::slight_smile:
Why did he/she give up on avast?

Anyway, if you want to check, after using the tool that David says, see, at least:

HKEY_LOCAL_MACHINE\SOFTWARE\ALWIL Software

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Aavmker4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aswMon2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aswTdi
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aswUpdSv\

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_AAVMKER4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_ASWMON2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_ASWTDI
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_ASWUPDSV
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_AVAST!_ANTIVIRUS\

HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Avast\

But there are more…