Since I have update my quick books desktop with enhanced assist payroll%2C It shows discrepancy in my

Welcome to the Community, @Mitra22. Thanks for sharing a brief description of your concern. 

Updating the company file shouldn't affect reconciliation. It could be that you've opened an incorrect company file which is why you see some discrepancy. 

To determine, let's find your most current backup first by performing a wild card search to find both backups and working company data files. Here's how: 

1. In the Search programs and files dialogue box, search for *.qbb for QuickBooks. QuickBooks working company file type is .qbw.
2. When the search completes, take note of the location in the In Folder column, the Size, and Date Modified column. Disregard any sample files. The Date Modified column will tell the last date the file was touched. However, if you just tried to sign in to an older file with a password, this file will have a current date.
3. To ensure that you have the correct file, run a Custom Transaction Detail report for all dates to view the last transaction entered into QuickBooks Desktop. 

If the file you opened is not the file you're looking for, close it. Then, repeat the step until you got the correct one. 

Please note that the default location for a QuickBooks Desktop company files is: C:\Users\Public\Public Documents\Intuit\QuickBooks\Company Files. 

If you still see the same thing after logging in to the correct company file, you can try these basic data damage troubleshooting steps on your company file. 

For future reference, check out this article: Fix beginning balance issues in QuickBooks Desktop. It helps you learn about the following reasons for beginning balance discrepancy with their fixes. 

Feel free to message again if you have other questions. We're always here to help you some more.