Sorry, as an AI language model, I don't have access to your computer or know which software is installed in it. Therefore, I cannot tell you the exact location of agl7.dll file. However, typically, DLL files are found in the "C:\Windows\System32" folder, or in the folder where the software that uses it is installed. You can try searching for the file in your computer's search bar to locate it.

agl7.dll文件安装方法：

一、如果您的系统提示“找不到agl7.dll”或“agl7.dll缺失” 或者“agl7.dll错误”等等，可能会导致某些软件和游戏等程序无法正常启动运行，并且导致电脑系统弹窗报错，此刻不要慌你只要在本站下载到该DLL文件并且在电脑上正确地重新安装mfc140.dl到Windows系统文件夹下载。

二、直接拷贝该文件到系统目录里：
1、Windows 95/98/Me系统，将agl7.dll复制到C:\Windows\System目录下。
2、Windows NT/2000系统，将agl7.dll复制到C:\WINNT\System32目录下。
3、Windows XP/WIN7/win10系统(64位系统对应64位dll文件，32位系统对应32位dll文件)，将agl7.dll复制到C:\Windows\System32目录下。 

4、如果您的系统是64位的请将32位的dll文件复制到C:\Windows\SysWOW64目录下。

三、然后打开 “开始-运行-输入regsvr32 agl7.dll” 或 “按win＋R键，输入regsvr32 agl7.dlll”回车即可解决错误提示！