One day, Weieisi Blog remade the company's system and used the ghost win7 package downloaded from the Internet. The installation of other software went smoothly. As a result, when it came time to install winscp, it prompted the lack of msvcr100.dll File, and whether you click OK or the X in the upper right corner cannot close this dialog box.
Reinstalling winscp is still prompted. Many online tutorials are still invalid after downloading VC suite from Microsoft's website and restarting the computer. We had to search the msvcr100.dll separate file and copy the msvcr100.dll file to C: Windows system32. If we use a 64 bit system like me, we will put it in C: Windows SysWOW64. At the beginning, I put the dll file in the wrong place, which made it difficult to use.
Finally, restart the computer and install winscp again successfully.