The laptop suddenly powered off and restarted on its own. After restarting, it loads the system startup repair but after restarting from the repair, it keeps launching the system startup repair over and over again.
After that, i tried to press F8 on the boot up screen to go into system restore. But however, despite the successful restore, it still gives me the "system startup" loop issue.
Boot into the Win7 DVD Repair Console or Repair CD to run Startup Repair repeatedly which does not depend upon possibly corrupt System files. System Repair Disc - Create
Next see if you can boot into Safe Mode to install, update and run Malwarebytes. If no Safe Mode, burn to CD free bootable BitDefender AV scan: FREE Bootable AntiVirus Rescue CDs Download List
Next from the System Recovery Options list on DVD/CD try System Restore, then the Command line to SFC -SCANNOW Run in Command Prompt at Boot.
If these all fail, check that the Win7 100mb System Reserved boot partition (preferred) or the Win7 partition are marked Active, then run Startup Repair from disk repeatedly again: Partition - Mark as Active You can have a picture to check for Active partition using free Partition Wizard bootable CD to Modify>Set to Active, then click on Win7 HD to highlight it and from Disk tab choose Rebuild MBR which may preclude the necessity to run the Repairs from DVd/CD.
If all fails, you can copy out your data using DVD/CD with this method: Copy & Paste - in Windows Recovery Console
Then run full factory Recovery from partition or disks, or use your Win7 installation DVD or find one to clean reinstall Win7 with Product Key on COA sticker: Reinstalling Windows 7
Since you didn't bother to mention your make or model of laptop we can't provide you with how recovery is run until you do so.
Quote