When it checks the integrity of the file, it keeps saying that its corrupt and to redownload the file which i have but it says the same thing.
any help would be much appreciated

Sorry about not posting sooner, but I've redownloaded the file and even had my norton turned off, and ran it as administor on vista, it still says its corrupt after checking its intergrity.

i used the md5 to check it and it didnt match, it is A1BBAC25C6F2FFA90E8FB936F75DEF6A,
im not sure if that helps, im going to check if i have any other programs that might effect it but i also bought unreal tournament 2004 and freespace 2 and used the downloader this time but they also say they are corrupted. I don't want to turn off my norton anymore as I am a college student living on campus and people always try to get on others computer so I will try again in coming weeks when i am home.

thanks for the help, but i got it working and installed, thanks for the help though.
i had spybot search and destroy running and it didn't realize it.