1. Fix the error: If you often can't enter the system normally, press F8 immediately after booting to see if you can enter the safe mode or configure the correct mode for the last time. If possible, it will automatically repair the registry after entering, and recall what you did when there were abnormal phenomena several times before. According to the suspected problem caused by an application software, it should be possible to uninstall, then exit normally and restart to enter normal mode. If you have security software, you can use 360 security guards plus 360 antivirus or Kingsoft Internet Security to kill all Trojans and viruses in safe mode.

Second, reinstall the system: If the above operations are invalid, you need to reinstall the system. There are many ways to install a computer system. You can choose the following.

1. Hard disk installation: After starting or restarting, press F 1 1 or F8 to check whether one-button GHOST or similar software is installed. If yes, select one-click restore and press Enter to confirm. After entering the one-button restore operation interface, select "Restore" to confirm. If a one-click backup was made when the machine was first installed, it can be restored to the state at the time of backup. In addition, if you can enter the current system or press F8 to enter the command line mode when booting up, you can search for the GHOST program and GHO system files in WINDOWS or DOS, and then manually run the GHOST program to load the system GHO files, or you can reinstall the system.

2.u disk installation: If there is no one-click restore, use the system U disk to reinstall the system. The operating steps for starting the U disk manufacturing and reassembly system are as follows:

(1) Making startup USB flash drive: buy a USB flash drive with a capacity of more than 8G from a physical store, search and download startup USB flash drive making tools such as peaches and Chinese cabbage on the Internet, insert the USB flash drive into a computer to run the software to make startup USB flash drive, and then download GHO files of operating systems such as WINXP or WIN7 from the system house or similar websites, copy them to the USB flash drive or USB flash drive folder designated by the startup tool, and rename them as needed. You can also search and download ISO format system image files (including GHO system files or complete system installation files) on the Internet, and release them to a USB flash drive through tools such as ultraiso to make a startup USB flash drive containing the system.

(2) Set the USB flash drive to start: press the DEL key (usually F2 for notebooks or others) to enter the BIOS setup interface, enter the BOOT tab to set the USB flash drive as the first startup item (note: some computers need to insert the USB flash drive for identification before setting), and then press F 10 to save, exit and restart. Some new motherboards support pressing F 12 or F 1 1 to enter the startup options menu, and you can directly select a USB flash drive or other required startup items to start the computer without entering the CMOS interface.

(3)U disk reloading system: insert the U disk to start the computer. After entering the U disk function menu, select "Install the system to the first partition of the hard disk", press enter to confirm, and follow the prompts. The computer will automatically run the GHOST software, automatically search the GHO file clone on the U disk, and install it in the C area. The whole process basically does not require human intervention until it finally enters the system desktop.

3. CD installation: the computer uses CD to reinstall the system, and the operation steps are as follows:

(1) Prepare the system CD: If there is nothing to buy in the computer shop, buy the latest CD of any system that needs to be installed. If you have a CD-ROM drive, you can also download the system files in ISO format and burn them to the system CD.

(2) Set the CD-ROM to start: press the DEL key (usually F2 for notebooks, or hot key according to the bottom line of the screen) to enter CMOS, set the CD-ROM or DVD-ROM as the first startup item on the BOOT tab, and then press F 10 to save, exit and restart. Insert the system CD into the CD-ROM drive in time when restarting the computer.

(3) Clone installation system: After the CD is successfully started, the function menu will be displayed. At this point, select "Clone and install the system to Area C" from the menu. After entering the car, the computer will automatically run the GHOST software, automatically load the GHO file and install it in Area C. The whole process basically does not require manual intervention until it finally enters the system desktop.

Note: After installing the system, first install 360 security guards and 360 antivirus or Kingsoft Internet Security software to thoroughly kill Trojans and viruses, then patch the system, install common software, download and install one-click restore tools for emergencies.