Actually, when downloading anything You should know what the file is and who sent it. Also, make sure you have a virus protection program installed.
The 3 do's when downloading:
1. Use virus protection software and update regularly. Do you know what virus protection software is on your computer
2. Follow the rules. If you aren't supposed to download files...then don't do it!
3. Use the original CD, or website when installing software.
READ BEFORE YOU CLICK through the steps, some companies try to slip extra software when you install the item you want.