@ Ashish Singh,
FYI in future posts, just click the Modify button to add on to your previous post. Thanks.

When you change versions of Avast, it is normal for the program to want to update to the most current definitions. It appears from your screen shot that it was in the middle of doing this. After the update was complete from a clean install, you should reboot if you had not done so already (from the clean install) and registered the product.
Is all working properly now? If not, reboot and then open the GUI and check.