HELP: Installing split up .rar and .part2 files

[ZeroTroubles]

Hi, I just downloaded LA Noire,


I now have a folder full of .RAR's; but also .Par2 files

Everyone says just open the first part with winrar and then extract it, but as soon as I open up the first winrar file it already gives me a TON of error popups like "this rar is corrupt, this rar is corrupt and this one is corrupt"

And this happens with EVERY single torrent file that has split up parts.

I did put it so that .par2 files always open with winrar, but really, please help me.

Want to play LA Noire and NFSTR so bad :L


Here's a pic;


Please help