I have hp elite book 6920 i tried to fresh install win7 .It installed correctly It finiases its setting including user name password date and time and wifi connection then welcome screen apears after that windows shows shutting down .Computer restarts and no operationg system loads ..Windows 7 loads during installtion process .but after completing instalation and finalising settings pc reboots and nothing is shown .Before this installation i was also using win7 it was running fine .Please help me to solve my problem