Here is the correct installation steps:
1. Install KAV first, otherwise KAV may block what it regards as threat, e.g. postgreSQL service etc.;
2. Once KAV installed, temporarily disable its protection ;
3. Install PostgreSQL;
4. Open KAV advanced settings, in exclusion rules, add followings:
- C:\Program Files\PostgreSQL\8.4\bin\pg_ctl.exe
- C:\Program Files\PostgreSQL\8.4\bin\postgres.exe