Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
If the problem is still there, try booting into the Safe Mode. Shut down the computer and then power it back up. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart. For each disable/delete, you will need to restart if you don't do them all at once.
You can also call Apple support since you get 90 days support.
or contact Apple on-line.
By mistakely I have deleted some important thing which I do not even know, now my macbook is refusing to open apple store and all others application. how can I fix this problem, I recently bought my mac book. It is less than 90 days.
Can you remember what you deleted? Have you emptied Trash yet?