Error during installation of WAS 6.3

I'm trying to install WebAs 6.30 on my PC.

O.S. is Windows XP Professional with RAM 512 mb

and more than 1,5 Gb on a NTFS filesystem.

I'm connected as a user defined as Administrator.

AT step "SAP System Installation/CReating SAP system port for C11" I received back an error during installation of "J2EE Engine 6.30 DEveloper Edition".

Looking into log sapinst_dev.log the last info are:

TRACE

Ejs_Base::dispatchFunctionCall()

JS Callback has thrown exception

Could someone give me an help ?

Regards,

Corrado Audero

caudero@yahoo.it