i was using dell studio 1450 laptop and my windows 7 operating system was crashed and i was encountering an error "operating system not found".I have an important data in my hard disk and i need to retrieve the data very safely with out any loose,i tried to reinstall os but i am unable to find the disk partitions,my previous os was installed in c drive,and i have my important data in e drive.......... what to do know 🙁.......... guys any ideas please help