Hit CTRL + ALT + Delete to open the process manager. There should be a process for the web assist installer, check the memory usage for the web assist installer process, if it is moving, then it is still processing through the install.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.