Hello Nairalanders, Please help! Once I input my username and Password my yahoo messenger disappears without connecting! I have my antivirus on, and it updates everyday, I have downloaded a new messenger and the same problem prevails. What do I do Please!!!

its probably a virus or some sort,even if u have an updated anti-virus,not all anti-virus might detect some virusses.
my suggestions.
Delete the current YM u have,
go to ur control panel under add/remove programs totally remove the YM or any file related to it there.
then re-install it again.
if it persists,back up ur files and re-format ur system or get ur IT person to look at it
well hope it helps

disable you firewall

try to view hidden files in any folder of your system if u don't see hiden files, know that your system have contacted a virus, It happened 2 me sometime ago, I Nodded it out With My Latest version of Nod32 Anti Virus, 

amvo.exe virus

Try updating your antivirus or try this

http://digitalpbk..com/2008/02/amvoexe-virus-usb-memory-stick.html

Good luck

definitely a virus.
happened to me too. I uninstalled and reinstalled yahoo mssgr 6 times! Yet d problem persisted. Finally got it out by using AVira Antivirus,
For d 1st tym, Kaspersky failed me.
Just find Avira and install,