Last year, when Avast added its Hardened mode to its antivirus software, the default was to have it disabled. You had to go into the software to enable it. I donít know if thatís still the case, so just something to be aware of.

Iíve had the Aggressive option, which is cloud-based whitelisting, enabled for a year on Windows XP Pro without any problems. To enable it, go to Settings > General.

For more information about Hardened mode, see this Avast forum post:

Avast Hardened mode.png