BUG #6388: I can not install postgre Sql

The following bug has been logged on the website:

Bug reference: 6388
Logged by: stoian
Email address: stoian_cris2004(at)yahoo(dot)com
PostgreSQL version: 8.4.10
Operating system: windows XP
Description:

I can not install postgre Sql . I get the following message: Sorry, could
not install Postgre SQL!.

Cause:
Output folder: C:\Program Files\PSQLINSTALL
top level install dir -->C:\Program Files
Is admin account
fs=NTFS
.NET found
Extract: TestFirewall.exe... 100%
Extract: TestFirewall.exe.config... 100%
Antivirus Installed: True
test antivirus returned 1
antivirus installed
security center error status: 0
security center status: 4
disabling security center
security center error status: 0
security center status: 1
disabled security center
seclogon error status: 0
seclogon status: 4
firewall enabled: 0
firewall not enabled
postgresql error status: 1060
postgresql status: 0
starting pgsql-8.3
postgresql error status: 1060
postgresql status: 0
postgresql error status: 1060
postgresql status: 0
starting postgresql-8.4
postgresql error status: 1060
postgresql status: 0
postgres installdir: C:\Program Files\PSQLINSTALL
==================== running PsqlTestClient
try userid: postgres
try pass: postgrespass
try pass: postgrespass
Connection to database failed: -->could not connect to server: Connection
refused (0x0000274D/10061)
Is the server running on host "127.0.0.1" and accepting
TCP/IP connections on port 5432?
<--error
1
testclient return status: 1
testclient return from file: 1
==================== finished PsqlTestClient
granting write permission on top level postgres directory
found dir
try rename C:\Program Files\PostgreSQL\8.4 --> C:\Program
Files\PostgreSQL\8.4-prev-2012-02-Jan-00-20-01
Create folder: C:\Program Files\PostgreSQL\8.4-prev-2012-02-Jan-00-20-01
Moving files: C:\Program Files\PostgreSQL\8.4\*.* to C:\Program
Files\PostgreSQL\8.4-prev-2012-02-Jan-00-20-01\
Remove folder: C:\Program Files\PostgreSQL\8.4\
renamed dir
wrote testfile
Delete file: C:\Program Files\PostgreSQL\testfile
Extract: postgresql-8.4.1-1-windows.exe... 100%
Execute: "C:\Program Files\PSQLINSTALL\postgresql-8.4.1-1-windows.exe"
--mode unattended --superpassword postgrespass
postgres installdir: C:\Program Files\PSQLINSTALL
==================== running PsqlTestClient
try userid: postgres
try pass: postgrespass
try pass: postgrespass
Connection to database failed: -->could not connect to server: Connection
refused (0x0000274D/10061)
Is the server running on host "127.0.0.1" and accepting
TCP/IP connections on port 5432?
<--error
1
testclient return status: 1
testclient return from file: 1
==================== finished PsqlTestClient

WHAT CAN I DO ?