Spyware.EmailObserver

After removing this spywere with anti spywere tool you have, open registry and delete :
"EmailObserver" = "C:\WINDOWS\system32\emos.exe /config"
from
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Run

and delete subkeys
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EmailObserver
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\emos
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\emossrv.

Than, restart your computer.