Boot into the Windows 7 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 Windows 7 100mb System Reserved boot partition (preferred) or the Windows 7 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 Windows 7 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 Windows 7 installation DVD or find one to clean reinstall Windows 7 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.