Les quedaba debiendo como quitar este virus, en inicio, dar run o ejecutar, escribir regedit y enter, hay dentro buscar lo siguiente:
HKEY_LOCAL_MACHINE
SOFTWARE
MICROSOFT
WINDOWS
CURRENTVERSION
URL
Dar click en el default prefix folder
doble click sobre predeterminado REG_sZ (en el panel de la derecha)
colocar como predetermiado
http://
Luego entrar a prefixes (lado izquierdo de la pantalla) y sobre cada uno de los valores de la derecha se le deja solamente hasta el //, ejemplo
ftp://
y aca van otras instrucciones que encontre en Internet :
Because this hijacker may change the default home and search page URLs, its also wise to check the following file for changes.
Open My Computer, and click on Tools
Click on Folder Options
Click on the View tab
Make sure "Show Hidden Files and Folders" is dotted and "Hide extensions for known file types" is unchecked
Click on Ok
Double-click on Drive C in My Computer
Double-click on Windows
Double-click on the INF folder
Right-click on IERESET.INF, and OPEN WITH Notepad.exe
Find the [Strings] and make sure it does not contain "prolivation.com"
If it is set to "prolivation.com" change the start_page_url and search_page_url values.
For IE 6, this would be:
START_PAGE_URL="http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome"
SEARCH_PAGE_URL="http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
Save the file