[ADMIN] unable to install postgresql 8.2

[saji verghese]

Hi,
 
Iam getting "User 'postgres' could not be created.The user account already 
exists.!" error while installing Postgresql version 8.2 in windows xp.There is 
no user account named postgres created.
 
Please help me in this regard. Thanks & RegardsSaji Verghese91-9941140433 
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