Before touching any game files, navigate to your Steam userdata folder and back up your STORM4.S or equivalent save files Reddit. Extract the Files: Use WinRAR or 7-Zip to open the archive.
Always prefer official solutions first: uninstall/reinstall Visual C++ from Microsoft's website, run sfc /scannow , or reinstall Steam. NXBUNSC-Fix-Repair-Steam-Generic.rar