Laptop starting problem

I’m using HP 630 Laptop. When i press start button it display a black window namely “System Information” and that window displaying Notebook model,product number,serial number,bios version etc…and in the end of the window showing ‘press to continue’ then when i press another window displaying namely “Windows Boot Manager” this window displaying ‘Choose an operating system to start, or press tab to select a tool’ then when i selecting windows 7 and press then the windows is Starting.

But, before a few days ago when i press start button it directly goes to starting windows. Why this happening? Pls Tell me the solution. Thank you.