Outlook Authentication problm?


Beta member
I have been facing authentication problem with Outlook exprss & microsoft outlook.All the POP & SMTP settings are fine.Even the password works fine in webmail but not in outlook .Whenever i face this type of problem i have to re-install the OS (XP -2) to get rid of this problem .I have faced this problem with many email ID's on dfrnt PC's ( I also configured OS on my friends & relatives Computers).There is no problem with the server or port settings because the same settings works fine , once the OS is reinstalled .I must be thinking this cud be a problm with the Outlook/ outlook express registry files.Pls help