Have to typed your ID and password correctly with correct letter case (with no space bar ,commas or period in between those?) .Please check it with cool head. You also have to make sure your windwos firewall or your personal anti-virus firewall is not blocking communication from Yahoo! server from your system,you also need to install properly the SNMP protocol and 'messege queing' with 'core functionality',HTTP proxy tools,active triggering (all available in your windows xp installation CD-ROM as 'Windows optional/additional component').If you still face problem then you have to look for whether your account has been 'hacked' or stolenCheck Your Name and Password at this Official Yahoo log-in site to check your account>>>
http://help.yahoo.com/l/us/yahoo/edit/..... click Sign in at top and it will take you to the official sign-in site.Check to see if you can log into yahoo mail here >>
http://mail.yahoo.com/If you cannot sign into either site then most likely you have fallen victim to one of the password stealing scams. Learn about Password Scams and how to protect yourself from them at >>
http://security.yahoo.com/password_scams... .If you think your password/account has been stolen then read the following link:Want to Recover a Password to a Lost or Stolen Account read this >>>
http://www.bigblueball.com/forums/186568... .if it has been deactivated for 'violation' or "suspended" for 'abuse' by CUSTOMER CARE then you'll have to appeal directly to Yahoo if you believe your account was suspended in error.Email Yahoo at these addresses:Answers-abuse@cc.yahoo-inc.comy_answrs_team@yahoo.com cc-advoc@yahoo-inc.com (Y! Customer Support)mail@cc.yahoo-inc.com (Email Support)Contact Yahoo by phone:Yahoo! Customer Service866-562-7219You can try leaving a message on the Yahoo! Answers Violation Notice Message Board and within a day or two, a Yahoo employee will review your post and respond:
http://messages.answers.yahoo.com/answer...You can also fill out these "Online Help" forms, which lets Yahoo know that you're experiencing a problem, and wait for a reply from Yahoo Customer Support:
http://help.yahoo.com/fast/help/us/m...hoo/edit/ge...