I have my sisters Toshiba laptop. She says it keeps trying to boot, flashes blue screen, restsarts repeatedly. Can't get past this. Windows 7 home edition. Last time she tried to start it, system asked to try repair. Prompted for restore back to, she hit cancel, system ran through repair, failed to be able to repair. On detail log, all processes have error code 0. But on System files integrity check and repair, the result was Failed, error code 0x490. Anybody have suggestion? I can remove hdd, use as external, put in new hdd, but don't have Windows license to reinstall since it was original install on computer when purchased. Don't want to lose data. HELP