When I turn on my laptop (Vaio k45 series), it says that: No Operating system Found (was running XP). I tried booting from the CD (you know, reformatting and all that) but it doesn't work. Should I just replace the HD and reinstall windows? Would that work? Is htere a slight chance that the info on the HD will be recoverable? Is it worht saving?! It is about 4 years old.