I have a satellite A65-S126. model no. PSA60U-02KO15. the laptop is failing to boot. When l power it up, Iit requires me to pick last known good configuration or us the safe mode options. I have tried to reinstall the operation system and when the installer tries to copy files to the disk, it gives the following error message, "file ntkrnlmp.exe could not be loaded. the error code is 7. setup cannot continue, press any key to exit".. l have checked my dvd rom by way of installing it on another similar laptop and it has worked. Have also checked my memory modules and they again proved to be working. Your assistance on this matter, team, will greatly be appreciated.