Hai Asif

         Thanks for your reply.the jdk path is 1.8 already.The error is

Assign Ports:

  [replace] Replaced 1 occurrences in 1 files.

  [replace] Replaced 1 occurrences in 1 files.

  [replace] Replaced 4 occurrences in 1 files.

  [replace] Replaced 1 occurrences in 1 files.

Configuration:

     [exec] Microsoft (R) Windows Script Host Version 5.8

     [exec] Copyright (C) Microsoft Corporation. All rights reserved.

     [exec] 

   [delete] Deleting: C:\PEGA\115291_P722-PE\pegaGuiInstallerTemp1\CreatePegaShortCut.vbs

     [exec] Microsoft (R) Windows Script Host Version 5.8

     [exec] Copyright (C) Microsoft Corporation. All rights reserved.

     [exec] 

   [delete] Deleting: C:\PEGA\115291_P722-PE\pegaGuiInstallerTemp1\CreatePegaShortCut.vbs

     [exec] Microsoft (R) Windows Script Host Version 5.8

     [exec] Copyright (C) Microsoft Corporation. All rights reserved.

     [exec] 

   [delete] Deleting: C:\PEGA\115291_P722-PE\pegaGuiInstallerTemp1\CreatePegaShortCut.vbs

PRPC Launching:

     [echo] Starting tomcat .... 

     [exec] 'cscript' is not recognized as an internal or external command,

     [exec] operable program or batch file.

I already tried to set the path C:\windows\system32\cscript.exe in system variable,but still it is showing the same error.kindly help me in this regard plz.

Hai Asif
I have mentioned the Java home at system variable and again tried finally Pega installed successfully thank you so much