Internet Optimizer Adware – NEM219.DLL
Nem219.dll is a browser helper object that installs with a adware program called Internet Optimizer. The Internet Optimizer/Nem variant hijacks both searches and error pages to it's controlling server. At the time of this writing, that's yoogee.com. This progarm may also send personal info to it's controlling server. Finally, it can update itself or download other files from it's controlling server.
We'd recommend removing this file. You can do so using WinPatrol or you can go to Control Panel > Add/Remove Programs and uninstall "Internet Optimizer" or "Active Alert".