Installation crashes

*Hello, I'm using windows 7 starter 32bits and I have the following issues:

When I tried to install an older version (8.3), it shows me a message like
this:
"An error has occurred executing the microsoft vc++ runtime installer"

Newer versions shows me this error:
"prerunscript.command.line.error" in 9.2.4v, I'm not an advanced user, but
here is the log file:
*

Log started 04/05/2013 at 10:35:49
Preferred installation mode : qt
Trying to init installer in mode qt
Mode qt successfully initialized
Executing
C:\Users\Jenni\AppData\Local\Temp/postgresql_installer_958a0fe061/temp_check_comspec.bat
Script exit code: 0

Script output:
"test ok"

Script stderr:

Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2 Data
Directory. Setting variable iDataDirectory to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2 Base
Directory. Setting variable iBaseDirectory to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2 Service
ID. Setting variable iServiceName to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2 Service
Account. Setting variable iServiceAccount to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2 Super
User. Setting variable iSuperuser to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2
Branding. Setting variable iBranding to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2 Version.
Setting variable brandingVer to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2
Shortcuts. Setting variable iShortcut to empty value
Could not find registry key
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.2
DisableStackBuilder. Setting variable iDisableStackBuilder to empty value
[10:36:08] Existing base directory:
[10:36:08] Existing data directory:
[10:36:08] Using branding: PostgreSQL 9.2
[10:36:08] Using Super User: postgres and Service Account: NT
AUTHORITY\NetworkService
[10:36:08] Using Service Name: postgresql-9.2
Executing cscript //NoLogo
"C:\Users\Jenni\AppData\Local\Temp\postgresql_installer_958a0fe061\prerun_checks.vbs"
Script exit code: 1

Script output:
Error de CScript: No se encuentra el motor de secuencias de comandos
"VBScript" para la secuencia
"C:\Users\Jenni\AppData\Local\Temp\postgresql_installer_958a0fe061\prerun_checks.vbs".

Script stderr:
Program ended with an error exit code

Error al ejecutar cscript //NoLogo
"C:\Users\Jenni\AppData\Local\Temp\postgresql_installer_958a0fe061\prerun_checks.vbs"
: Program ended with an error exit code

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