cant install PostgreSQL (wich PT3 include)

[gr_father]

When I try to install PT3 and it comes to installing PostgreSQL, you get the error "Service" PostgrSQL Server 8.3 "failed to start.Verify that you have sufficient privileges to start system service?"
I logged in WindowsXP under the administrator and have the right encfyfdkbdfnm on this computer any program.

What should I do to correct errors?

[kraada]

This error occurs as a result of anti-virus, anti-spyware, or anti-spam software not allowing system services to be installed. Disable these programs and attempt to install again. These issues have been known to happen with IE 8 Beta 2, NOD 32, Norton Antivirus, F-Secure Antivirus, ZoneAlarm and Spampal. Once PostgreSQL has been successfully installed you may reactivate your third-party software.

[Swant]

I get the same message.
I use Avast antivirus and Comodo firewall. I close both applications but I still get the same message.

I guess something is running in the backgrund. Any ideas?

[Swant]

I have no idea what I did but I finaly got it to work.

[kraada]

Try actually uninstalling Avast and then installing PostgreSQL and see if that works. (Whether or not it works, you can reinstall Avast after the attempt.)