@mdimran Try to remove your local data by deleting the Postman folder.
Full instructions are outlined in this doc: https://support.getpostman.com/hc/en-us/articles/360025359014-How-to-resolve-the-Could-not-open-Postman-error-.
On Windows, open File Explorer and paste in the Path field
C:\Users\<user>\AppData\Roaming\Postman and
C:\Users\<user>\AppData\Local\Postman
If you have multiple versions of the app installed on your computer - please make sure to remove them before reinstalling the app.