Help installing virtual pc 2007

Seasons Greetings All ! I am trying to install microsofts 2007 virtual pc, I have downloaded it 2 times and when I try to install the program my win zip says that the file is corrupt or incomplete, anyway when I lookin the folder it has a file called- additionsISO. OK , now I downloaded both MagicDISC/MagicISO, and I could not open the file with either of them, now I'm quite sure the problem lies with my pc skills!!! lol I am an artist not a computer wiz, so in the kindly spirit of the season would someone draw me a picture of how to do this? PLEASE?? Merry ChristmasD