How to install VST plugins on a Windows computer
1. Make a folder on your C drive, under the Program Files folder and call it "VSTplugins". (I like to organize my VSTplugins folder into sub-folders like "Instruments", "Effects", etc..)
2. Most plugins use an installation program that will guide you through the install process. Make sure you tell these programs to install your plugins in the folder from step 1. (Many of these programs will be compressed when you download them. This is indicated by a zipper in the icon. To uncompress a file or folder, right-click on it, choose "Extract All", and click "Extract" in the window that pops up. This will create a new uncompressed folder in the same directory as the compressed folder.
3. The exception to step 3 is the VSCO2 Rompler - When you download it you will get a compressed folder. Right-click on that folder, choose "Extract All", and click "Extract" in the window that pops up. This will create a new folder called "VSCO2 Rompler - 64"in the same directory as the compressed folder. Move this entire folder to the "VSTplugins"folder you create in step 1.
4. In Ableton, open Preferences and under the "File Folder" tab, set "Use VST Plug-In Custom Folder" to "On" and set the VST Plug-In Custom Folder to the folder you made in step 1. (Ableton will only automatically search for VSTs upon startup - if you install a plugin while Ableton is running, you will not see until you either restart Ableton, or perform a "Rescan for Plugins" in Preferences under the "File Folder" tab.)