Win7 system time is not accurate, but when it was modified, it found that it could not be modified. How can we solve this problem? Let Xiaobian help you analyze the reasons for this problem and how to solve it.
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System time can not be modified reason analysis:
First, the motherboard battery (cmos) no electricity
Second, no modification time permissions
Third, the computer exists Virus (the purpose of such virus modification time is to make anti-virus software not use, or cause some software to run abnormally, such as securities stock software)
Solution:
1, judge whether the cmos battery is dead, first start After the laptop enters the bios interface, then modify the time, save and exit, turn off the computer to restart, and then enter cmos to view, if the time is run according to the modification, it means that the battery is no problem, otherwise you need to replace the battery, if you replace the battery After that, it still doesn't work. It may be that there is a problem with the motherboard.
2, to determine whether it is a virus, some computers can be modified in windows time, but after the modification, it quickly jumps to a wrong time, this situation is a virus, if the time can be modified, but after the restart time If it is not right, then after the time is modified, start the computer and enter bios. If this time is wrong, it means that the motherboard battery is dead. If the time is right, the time will be wrong after entering windows. The description is a virus.
3, check whether there is time to modify the permissions, first figure out the windows user name of their computer, if you do not know, press ctrl + alt + del three keys to view.
1) First click Start — Run, enter secpol.msc in the run dialog, then press Enter;
2) In the pop-up "Local Security Policy" window, expand the positioning Go to "Local Policies--"User Rights Assignment";
3) Then find and double-click "Change System Time" in the list on the right to pop up a window (if the operation cannot be completed, you are not managed) Permissions, log in again with administrator), which lists the list of users with permissions. If you find that there is no user name, you have no permission. If you already have your username, you have permission, but if the time is still Unable to modify, the description is a virus.
4) If it is a situation without permission, increase the permission and then modify the time. If it is judged to be a virus and there is no effective anti-virus method at present, it is recommended to cancel the time modification permission of all users, and then follow the steps below!
Cancel permissions: Select users from the list, click Delete, then click OK.
Add permissions: Click “Add user or group”, then click Advanced, select users from the list, confirm the selection, then click OK to close.
This is the reason and solution for the time when the Win7 system cannot be modified. If you have any problems with this problem, let's take a look.