hi, i have a problem with my VGN-NS20M initially windows would not boot i got into the hardware diagnostics and it state there is error 4 on hdd. i have 2 and a half years of uni work on here and half of my 8000 word dissertation which i really dont want to lose. i didnt make back up disks!!!!!(smacks self in head) i really dont want to lose the work i have on it. is there anything i can do fix this or will it have to go in for repair??. could anyone give me a rough guesstimatem on how much it may cost? i did buy extended warranty when i bought it but am pretty sure it is almost up and i cant find any policy documents anywhere grrr.