Dear Ashish,
check .log files in directory C:\Program Files\SAP\sapinst_instdir\NW\ABAP\SDB\... (or similar).
I suppose you install SAP system od MS Windows box. First you should check file import_monitor.log,
find there name of failed job and open job log file (e.g. SAPAPPL1.log). There should be a reson.
I you solve the problem, you can restart import in SAPINST. It should continue import where it
stopped.
Regards,
Andrej