My laptop doesnot start up. erer massege saisafter

try to reinstall the OS, from cd drive, you'll need to booth it first from cd(press F10 or F12 after power it on and choose the first booth at your cd drive. then follow instruction for reinstalling the OS, first try to repair it, it might solve the problem but if not try a fresh install or clean install.

hope this will solve the issue

Sorry, it sounds like you have an illegal copy of Windows.