Hello Ramesh,
If you upgraded anything you shouldn't have needed to remove then readd the datasources at all. Also you should be on NFA 9.1.3 and not NFA 9.1.2 as there were many bugs in NFA 9.1.2 that are now fixed. Also the download was pulled for that version.
Here are the steps to readd the datasource.
Log into the NFA Console
Open Web browser to the URL
http://localhost/ReporterDataSource/ProductSyncWS.asmx
Click on the link ProductID
This will open a new page where you will click INVOKE
Once completed you should see a code like the following:
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="http://netqos.com/ProductSyncWS">40b8211d74d245f88a095a653d6f1e34</string>
Take the 40b8211d74d245f88a095a653d6f1e34 and copy it.
Now go back to the product sync URL where you clicked ProductID and now select UnregisterPerformanceCenter
Paste the copied ID into the field and click INVOKE.
Open a cmd prompt and run 'iisreset'.
Go back to the CAPC Administration page and remove/add the datasource again.
Give it a few minutes then test readding NFA in NPC again.