1.   Before we start, make sure you have the emergency disk we made last week.

2.   Boot with the emergency disk and start the circus.

3.   If the problem continues, use your emergency disk to restart.

4.   It can create a bootable emergency disk and find conflicts between software.

5.   Label that disk and put it up with the emergency disk.

6.   Then try to start your PC without the emergency disk.

7.   Your emergency disk can cure this sparrow.