Check if file SAPSSL.pse does exist ot the location and it has the right permission.
Right click on the file and check properties if correct user is set
You can set new password to pse using below command where password is your pse pin.Other details you can find using TCode strustsso2 or strust
sapgenpse get_pse -p SAPSSL.pse -x password -r SAPSSL.req "CN=abc.com, OU=abc, OU=SAP
For more details follow below link
http://help.sap.com/saphelp_nw70ehp1/helpdata/en/48/9a9a6b48c673e8e10000000a42189b/frameset.htm