Downloading Issue

Please help, when I download a large mod Like Toons for example always says as winrar opens file this a crc error file is corrupt.It seems this occurs on large files? I have windows 7 does anyone know why.

it is because the file didn't downloaded correctly, it is much more prone to happen when a file is big enough.

the best way to download large mods or files is using bitorrent. ask for the modder to host it there

Download it, again, and run nothing but Win 7, your firewall and the download. Autoupdaters, IMs, and multitasking corrupt more downloads. Win 7 has nothing to do with it.
You can open it with Winrar, and 7zip.

^^ you are really paranoid with those things