Script error with yahoo messenger and hotmail and windows update

[Guest]

i get this error whenever i open yahoo messenger, hotmail or windows update.

an error has occured on the script of this page.
line: 2
char: 1
error: invalid character
code: 0
url: http://messenger.yahoo.com/external/client_ad.php?p=409640 (yahoo
messenger)

hotmail and windows update appears distorted.
will appreciate any help.

 

[Guest]

Disable addons and uncheck this
http://www.iinet.com/images/screenshots/general/popupblocker_ie-advanced-options.gif "Enable third party browser extensions"

Do you still get this error?

I don't want to create panic but there is a little risk there is a virus.
check your hosts.