Welcome to the community. 
First of all, please do not post in old threads that have been inactive for years. This is referred to as “necromancing” and is generally frowned upon in probably 99 out of 100 forum communities online.
I split your post into its own thread.
As the user above suggested, launch Task Manager. Locate all instances of WeMod under all the headers and right click them. Then choose “End Task”.
You have the default Windows Defender on your machine, which is an antivirus that cannot be removed because it is permanently embedded into the operating system.
Here are the instructions to resolving your installation issue, which is, 99% of the time we get this report, caused by a security program on your PC or network: I can’t Install WeMod / “There was a error installing the application” - WeMod App / Support.