try

            {

                //系统盘

                string nl = Environment.NewLine;

                string query = "%SystemRoot%";

                string str = Environment.ExpandEnvironmentVariables(query);

                string str32Path = str + @"\System32\crypto.dll";            var filePath64 = @"key/32dll/crypto.dll";

                //验证系统盘system32与是否有dll，有则跳过，无则复制

                if (!File.Exists(str32Path))

                {

                    File.Copy(filePath32, str32Path);

                }                            return true;

            }

            catch (Exception ex)

            {

                MessageBox.Show("导入dll到系统盘失败，错误原因为："+ex.Message);

                return false;

            }