I downloaded all 5 files and extracted them. Then I run setup. When the satus is: Removing backup files, there has problem: a DOS window poped up and everything stopped. I closed DOS window manually and click finish button. I can find VA3.5 icon in start-programs. But there has no response when I run it. I opened the task manager, VA3.5 doesn't run at all. I tried to run it in DOS window manually, the result is the same: nothing happened. Why?

Thanks a lot