Win7 accidentally deleted iertutil.dll can not boot after the solution

If we are operating the win7 mirroring system often encounter some problems, for example, we accidentally deleted our system file ertutil.dll, and then it may lead us The computer can't be turned on, and it is difficult to find the file. After we delete it, we will not be able to boot because there is no such system file. If you have encountered the same problem, what should you do? solve.
1. We right click on the blank space of our desktop, then see the task manager open it, a new window will appear, directly using the shortcut key can also be opened directly by Ctrl+Shift+Esc.
2, we open the win7 new window in the upper left corner of the menu bar there is a file typeface, and then select a new task in the task, write the C:\\WINDOWS\\system32 command in the browse task, and finally confirm the above operating.
3, then we open the cmd.exe process window, but you can directly copy cd c:\\windows\\system32\\dllcache directly enter the key. Then copy the copy iertutil.dll c:\\windows\\system32 command to the same Enter key, and then our window will appear a prompt to copy the file.
We often encounter missing files on the computer, then we can download the copy on other computers and then put them in the corresponding folder if they can't download them, then restart them, win7 Encounter.dll encountered when the system is booted can be solved by the above method.