The computer has been booting Windows without system solutions
This is a computer disk problem please fix it (each disk tries to fix it or fix only a certain letter).
Computer system with Disk repair tutorial:
Click the right mouse button on my computer to select the property. Select "Tools → start check" in the Pop-up Drive Properties window and select "Automatically fix file system errors" and "scan and restore bad sectors", then click Start, the scan time will vary with disk capacity and scanning options for a short ( According to the above method, will pop up a box, the point is, automatic shutdown after the boot to repair, Win7 selected according to the scheduled disk check button.
Hard drive bad track can cause the computer system files damaged or lost, the computer can not start or panic (computer card in the startup of Windows is likely to result). Hard drive bad track can be repaired with NDD disk tool or ScanDisk.
If the fault is still, restore the computer system or reinstall system (or not to format the hard disk repartition reload, in the no need to change the hard drive, or overhaul to go to it).
Enthusiastic answer: In the prior to the system in the options, do not choose "Automatic Repair", select the "Use the last Correct boot system" option to go in, but also do not go back to the system, the system is estimated to collapse.
It is important to use the computer when not too violent, regular computer checkup, recommend the use of Master Lu. Remember to back up your computer data during the interval.