In windows XP its eazy to do. If you think the previous service user for PostgreSQL is still exists goto the Administrative Tools --> Computer Management --> Local User & Groups. Here you will get the Postgres Account (Postgresql service account). Simply delete that.
I hope this will solve your problem.
Pushpendra Singh Thakur
COREEXPERTS Technologies Private Limited Business Process Automation & IT Support Services http://www.corexprts.com Phone - 91-761-4070036 Fax - 91-761-4010530 SMS - 91-799-66554
-- Pushpendra Singh Thakur
COREEXPERTS Technologies Private Limited Business Process Automation & IT Support Services http://www.corexprts.com Phone - 91-761-4070036 Fax - 91-761-4010530 SMS - 91-799-66554