Trojan Horse Agent.MQO is associated with HP VIEW toolbar. AutoTBar.exe. Check out your start up menu and it will probably be loading on startup.

If you disable the HP VIEW toolbar in IE and rearrange the toolbars on a reboot they will be back as they were before if this is left enabled. AutoTBar.exe. I had the same problem but was able to "HEAL" it by using the AVG virus program.

It is now gone.