Frm last few month mail are comming that i won a prize from msn yahoo, or UK lottery asking courier charges,

Yahoo do not operate a lottery. This is a scam. Unscrupulous thieves have sent you this email and they are trying to part you from your hard earned cash. They will often ask you to call a premium rate number and keep you holding on whilst you rack up a huge phone bill. They are then paid a large proportion of this phone bill. They may ask you to divulge personal information about yourself or ask for your bank or credit card details. Do not divulge any such information under any cirstances. I suggest you delete the email and send it into cyberspace, hopefully along with the thieving sbags who send them.