Win7 boot black screen prompts Windows failed to start. How to solve

This morning, a colleague computer has the following problem: Windows failed to start.A recent hardware or software change might be the cause.To fix the problem:

1.Insert your Windows installstion disk and restart your computer

2.Choose your language setting, and then click "next"

3.click "Repair your computer."

If you do not have this Disk,contact your system administrator or computer manufacturer for assistance.

File:\\windows\\system32\\Drives\\KAVBootc.sys

1, first analyze the system error display error < Br>

Absolutely means: Windows failed to start. This situation may be caused by your recent hardware or software changes. To fix this problem, please do the following

1) Insert your Windows installation CD and restart your computer.

2) Select your language settings and click “next”.

3) Click "Fix your computer”.

2, prompt system startup failure, it can be seen that the system you installed has a problem, you can replace a stable image that has been verified to be installed, maybe a stable mirror can solve the problem

3. If you replace the verified image, this error still occurs. Try to format the hard disk and install it again. It is because a vendor-installed partition is hidden before the main partition for the whole system detection. Therefore, you should pay attention to this problem when installing or reinstalling the computer on the computer. When installing the system, make sure that there is no hidden partition. In the case, the system is installed. Otherwise, there will be: blue screen. The installation time is too long., the copy process is wrong, etc.

4, today's colleague's back, The system can be installed normally by completely formatting the hard disk.