Outpost Firewall Pro – WL_HOOK.DLL
Wl_hook.dll installs with Outpost Firewall by Agnitum. It's normal for this file to be running whenever your firewall is enabled. In most cases, this will mean that the file will run on system startup. Please don't remove wl_hook.dll or outpost.exe as doing so could take down your firewall protection.
More information on this program can be found at http://www.agnitum.com/products/outpost/.
Safe
Agnitum