I bought an Acer Extensa. I bought an Acer Extensa 2303WLM computer about four years ago, but due

Question

I bought an Acer Extensa 2303WLM computer about four years ago, but due to a recent virus on my computer I had to have a local technician reinstall my computer, because it was the only way to remove the virus. I got my computer back tonight and have found that some of the programs on the computer when I first bought it are no longer there. How would I go about attaining for free certain programs like Arcade 3.0, NTI CD & DVD-Maker Gold and Power Producer which were there originally but were lost in the reinstallation process?