I have had the evaluation copy of WinRar on my computer for over a year and it still works fine. In fact, you don't even have to launch the WinRar application to unzip files. If you have more than one WinRar file to unzip, just simply highlight all the files and right click any one of them and select "Extract Here" and it will unzip all the files one at a time and automatically combine them into one file. Now this is only if you are trying to unzip a video file that has been divided into several smaller files. If it's only one file you are trying to unzip, do the exact same thing as above and you will be just fine. Technically, you don't need ever double click on the WinRar program itself, and then browsing to the file you want to unzip. It's easier to just right click on the zipped file itself and extract it from there. Follow these steps and you won't ever see that message.