Hi

I am unable to install pega 8.7 in my system. while installing getting an error "unable to connect to database"

Initialization:
     [echo] Beginning installation of Pega Platform 8.7.0 Personal Edition -- this process should take about 5-10 minutes ...
    [unzip] Expanding: C:\Users\RAPVIJAY\Downloads\117149_PE_8.7\pegaGuiInstallerTemp0\PersonalEdition.zip into C:\PRPCPersonalEdition
     [echo] Configuring Tomcat (Setting Java Home and Catalina Home)...
  [replace] Replaced 0 occurrences in 0 files.
  [replace] Replaced 1 occurrences in 1 files.
  [replace] Replaced 2 occurrences in 1 files.
  [replace] Replaced 1 occurrences in 1 files.

Database Server Installation:
     [exec] The files belonging to this database system will be owned by user 
     [exec] This user must also own the server process.
     [exec] 
     [exec] The database cluster will be initialized with locale "English_India.1252".
     [exec] The default text search configuration will be set to "english".
     [exec] 
     [exec] Data page checksums are disabled.
     [exec] 
     [exec] creating directory C:/PRPCPersonalEdition/pgsql/data ... ok
     [exec] creating subdirectories ... ok
     [exec] selecting default max_connections ... 20
     [exec] selecting default shared_buffers ... 400kB
     [exec] selecting default timezone ... Asia/Calcutta
     [exec] selecting dynamic shared memory implementation ... windows
     [exec] creating configuration files ... ok
     [exec] Execution of PostgreSQL by a user with administrative permissions is not
     [exec] permitted.
     [exec] The server must be started under an unprivileged user ID to prevent
     [exec] possible system security compromises.  See the documentation for
     [exec] more information on how to properly start the server.
     [exec] child process exited with exit code 1
     [exec] initdb: removing data directory "C:/PRPCPersonalEdition/pgsql/data"
     [exec] running bootstrap script ... 
     [exec] pg_ctl: directory "C:/PRPCPersonalEdition/pgsql/data" does not exist
     [echo] 
     [echo] Waiting for Postgres to start...
Unable to connect to database -- will retry in 1 second...
Unable to connect to database -- will retry in 1 second...
Unable to connect to database -- will retry in 1 second...
Unable to connect to database -- will retry in 1 second...
Unable to connect to database -- will retry in 1 second...